Authentication. Agenda. IT Security course Lecture April 14 th Niels Christian Juul 2. April 14th, 2003

Size: px
Start display at page:

Download "Authentication. Agenda. IT Security course Lecture April 14 th 2003. Niels Christian Juul 2. April 14th, 2003"

Transcription

1 Authentication IT Security course Lecture April 14 th 2003 Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax: Agenda 1. Kerberos 2. Central Authentification Service (CAS) 3. PubCookie 4. Secure Electronic Transaction (SET) 5. CAS & SSO at RUC 6. Kerberos Encryption Techniques Niels Christian Juul 2 1

2 1. Kerberos User-authentication in a Distributed System Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax: Kerberos: Design Rationale trusted key server system from MIT provides centralized private-key third-party authentication in a distributed network allows users access to services distributed through network without needing to trust all workstations rather all trust a central authentication server two versions in use: 4 & 5 Niels Christian Juul 4 2

3 Kerberos Requirements first published report identified its requirements as: security reliability transparency scalability implemented using an authentication protocol based on Needham-Schroeder Niels Christian Juul 5 Kerberos 4 Overview a basic third-party authentication scheme have an Authentication Server (AS) users initially negotiate with AS to identify self AS provides a non-corruptible authentication credential (ticket granting ticket TGT) have a Ticket Granting server (TGS) users subsequently request access to other services from TGS on basis of users TGT Niels Christian Juul 6 3

4 Kerberos 4 Overview Niels Christian Juul 7 The Needham-Schroeder symmetric-key protocol [NS78] 1. A S: A, B, Na 2. S A: {Na, B, Kc, {Kc, A}Kb }Ka 3. A B: {Kc, A}Kb 4. B A: {Nb}Kc 5. A B: {Nb-1}Kc Where: A, B are principals; S is a trusted key server Ka, Kb are secret keys shared with S {X, Y}K means: X concatenated with Y, encrypted with K Na, Nb are nonces; fresh (not used before) Kc is a fresh connection key Niels Christian Juul 8 4

5 Kerberos Model Network services that require authentication are required to register So are the clients that also wish to use services Niels Christian Juul 10 2 Types of Credentials used in Kerberos Tickets Authenticators Niels Christian Juul 11 5

6 Kerberos Tickets used to authenticate client to a server consists of 2 parts one encrypted one in plaintext contains name of server in plaintext name of client network address of the client timestamp in the form of a nonce to prevent replays period of validity of the ticket session key that will be used to secure dialogues between the client and the server Only valid for a single server and a single client Niels Christian Juul 12 Kerberos Authenticators Contains additional information which when compared with against that in the corresponding ticket proves beyond doubt that the client presenting the ticket is the same one to whom the ticket was issued Contains the name of the client network address of the client timestamp in the form of a nonce to prevent replays Proves that the client has knowledge of the session key included in the ticket Niels Christian Juul 13 6

7 Obtaining a Ticket When user requires a service, she sends a request to the Kerberos server requesting it to grant the user a ticket for a server User sends an identity, name of server for whom the ticket is required and a nonce Kerberos server checks that it know the identity of the client and generates a session key and another nonce Encrypts these 2 fields and the secret key of the user which it obtains from its secure database Then creates a ticket for the end server that includes the session key Niels Christian Juul 14 Obtaining a Ticket continued Contents of the ticket are encrypted using the shared key of the end server that the Kerberos server obtains from its secure database Kerberos server sends the ticket along with a copy of the encrypted session key back to the client Once response received by the client, she uses her key to decrypt it Niels Christian Juul 15 7

8 Kerberos Service Request Once client has obtained a ticket for a specific service, it builds an authenticator containing the name of the client, the network address of the client and a timestamp Authenticator is encrypted with the session key Client sends the encrypted authenticato and the service ticket to the server Niels Christian Juul 16 Kerberos Service Request continued Server decrypts the ticket using its key and recovers the session key Then decrypts the authenticator and matches the fields contained with the authenticator of that in the ticket If all fields match, then the server allows the request to proceed Niels Christian Juul 17 8

9 Kerberos Realms a Kerberos environment consists of: a Kerberos server a number of clients, all registered with server application servers, sharing keys with server this is termed a realm typically a single administrative domain if have multiple realms, their Kerberos servers must share keys and trust Niels Christian Juul 18 Niels Christian Juul 19 9

10 Kerberos Version 5 developed in mid 1990 s provides improvements over v4 addresses environmental shortcomings encryption alg., network protocol, byte order, ticket lifetime, authentication forwarding, interrealm auth and technical deficiencies double encryption, non-std mode of use, session keys, password attacks specified as Internet standard RFC 1510 Niels Christian Juul 22 Niels Christian Juul 24 10

11 2. Central Authentification Service (CAS) Yale University - Information Technology Services (ITS) Central Authentication Service (version 1.0) URL: Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax: CAS Design Rationale To facilitate single sign-on across multiple web applications, as well as to core services that aren't necessarily web-based but have a web front end. To allow both trusted and untrusted services (internal as well as external) to authenticate users without having access to their passwords. To simplify procedures that applications need to follow in order to perform authentication. To localize actual ("primary") authentication to a single web application, which makes it easier for users to safeguard their passwords, and For the central service to change the authentication logic if necessary without having to change numerous applications. Niels Christian Juul 27 11

12 CAS Protocol overview Niels Christian Juul 28 Niels Christian Juul 29 12

13 Compare How (security-wise) are CAS and Kerberos different and alike? Niels Christian Juul Pubcookie an open-source package for intra-institutional single-sign-on end-user web authentication Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax:

14 Niels Christian Juul 32 Single Sign-on If, in step 4, the "granting request" is accompanied by a previously established, valid "login cookie" (as set in step 8), then steps 5, 6, and 7 are skipped, and the login server proceeds to step 8, issuing a "granting cookie" using the username as found in the "login cookie". This provides the "single sign-on" experience for the user, allowing him or her to request resources tied to other Pubcookie-authenticated resources without having to re-enter a password as long as the "login cooke" is still valid (e.g. for 8 hours after the intial sign-on). Niels Christian Juul 33 14

15 Compare How (security-wise) are CAS and Pubcookies different and alike? Niels Christian Juul Secure Electronic Transaction (SET) Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax:

16 Secure electronic transactions (SET) designed for payment-card transactions over Internet. provides security services among 3 players: customer merchant merchant s bank All must have certificates. SET specifies legal meanings of certificates. apportionment of liabilities for transactions Customer s card number passed to merchant s bank without merchant ever seeing number in plain text. Prevents merchants from stealing, leaking payment card numbers. Three software components: Browser wallet Merchant server Acquirer gateway Niels Christian Juul 36 SET vs SSL - Danish PBS Niels Christian Juul 37 16

17 Secure Electronic Transactions (SET) open encryption & security specification to protect Internet credit card transactions developed in 1996 by Mastercard, Visa etc not a payment system rather a set of security protocols & formats secure communications amongst parties trust from use of X.509v3 certificates privacy by restricted info to those who need it Niels Christian Juul 38 SET Components Niels Christian Juul 39 17

18 SET Transaction 1. customer opens account 2. customer receives a certificate 3. merchants have their own certificates 4. customer places an order 5. merchant is verified 6. order and payment are sent 7. merchant requests payment authorization 8. merchant confirms order 9. merchant provides goods or service 10.merchant requests payment Niels Christian Juul 40 Dual Signature customer creates dual messages order information (OI) for merchant payment information (PI) for bank neither party needs details of other but must know they are linked use a dual signature for this signed concatenated hashes of OI & PI Niels Christian Juul 41 18

19 Purchase Request Customer Niels Christian Juul 42 Purchase Request Merchant Niels Christian Juul 43 19

20 Purchase Request Merchant 1. verifies cardholder certificates using CA sigs 2. verifies dual signature using customer's public signature key to ensure order has not been tampered with in transit & that it was signed using cardholder's private signature key 3. processes order and forwards the payment information to the payment gateway for authorization (described later) 4. sends a purchase response to cardholder Niels Christian Juul 44 Payment Gateway Authorization 1. verifies all certificates 2. decrypts digital envelope of authorization block to obtain symmetric key & then decrypts authorization block 3. verifies merchant's signature on authorization block 4. decrypts digital envelope of payment block to obtain symmetric key & then decrypts payment block 5. verifies dual signature on payment block 6. verifies that transaction ID received from merchant matches that in PI received (indirectly) from customer 7. requests & receives an authorization from issuer 8. sends authorization response back to merchant Niels Christian Juul 45 20

21 Payment Capture 1. merchant sends payment gateway a payment capture request 2. gateway checks request 3. then causes funds to be transferred to merchants account 4. notifies merchant using capture response Niels Christian Juul 46 Compare How (security-wise) are SET and SSL different and alike? Niels Christian Juul 47 21

22 5. CAS & SSO at RUC Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax: Niels Christian Juul 49 22

23 6. Kerberos Encryption Techniques Niels Christian Juul Computer Science, building 42.1 Roskilde University Universitetsvej 1 P.O. Box 260 DK-4000 Roskilde Denmark Phone: Fax: Niels Christian Juul 51 23

Authentication Applications

Authentication Applications Authentication Applications will consider authentication functions developed to support application-level authentication & digital signatures will consider Kerberos a private-key authentication service

More information

Authentication Applications

Authentication Applications Authentication Applications CSCI 454/554 Authentication Applications will consider authentication functions developed to support application-level authentication & digital signatures Kerberos a symmetric-key

More information

Chapter 4. Authentication Applications. COSC 490 Network Security Annie Lu 1

Chapter 4. Authentication Applications. COSC 490 Network Security Annie Lu 1 Chapter 4 Authentication Applications COSC 490 Network Security Annie Lu 1 OUTLINE Kerberos X.509 Authentication Service COSC 490 Network Security Annie Lu 2 Authentication Applications authentication

More information

How To Use Kerberos

How To Use Kerberos KERBEROS 1 Kerberos Authentication Service Developed at MIT under Project Athena in mid 1980s Versions 1-3 were for internal use; versions 4 and 5 are being used externally Version 4 has a larger installed

More information

Chapter 15 User Authentication

Chapter 15 User Authentication Chapter 15 User Authentication 2015. 04. 06 Jae Woong Joo SeoulTech (woong07@seoultech.ac.kr) Table of Contents 15.1 Remote User-Authentication Principles 15.2 Remote User-Authentication Using Symmetric

More information

Authentication Application

Authentication Application Authentication Application KERBEROS In an open distributed environment servers to be able to restrict access to authorized users to be able to authenticate requests for service a workstation cannot be

More information

Authentication applications Kerberos X.509 Authentication services E mail security IP security Web security

Authentication applications Kerberos X.509 Authentication services E mail security IP security Web security UNIT 4 SECURITY PRACTICE Authentication applications Kerberos X.509 Authentication services E mail security IP security Web security Slides Courtesy of William Stallings, Cryptography & Network Security,

More information

Kerberos. Guilin Wang. School of Computer Science, University of Birmingham G.Wang@cs.bham.ac.uk

Kerberos. Guilin Wang. School of Computer Science, University of Birmingham G.Wang@cs.bham.ac.uk Kerberos Guilin Wang School of Computer Science, University of Birmingham G.Wang@cs.bham.ac.uk 1 Entity Authentication and Key Exchange In the last talk, we discussed key exchange and reviewed some concrete

More information

Network Security Protocols

Network Security Protocols Network Security Protocols EE657 Parallel Processing Fall 2000 Peachawat Peachavanish Level of Implementation Internet Layer Security Ex. IP Security Protocol (IPSEC) Host-to-Host Basis, No Packets Discrimination

More information

CS 4803 Computer and Network Security

CS 4803 Computer and Network Security Many-to-Many Authentication CS 4803 Computer and Network Security s? Servers Alexandra (Sasha) Boldyreva Kerberos How do users prove their identities when requesting services from machines on the network?

More information

Lecture 31 SSL. SSL: Secure Socket Layer. History SSL SSL. Security April 13, 2005

Lecture 31 SSL. SSL: Secure Socket Layer. History SSL SSL. Security April 13, 2005 Lecture 31 Security April 13, 2005 Secure Sockets Layer (Netscape 1994) A Platform independent, application independent protocol to secure TCP based applications Currently the most popular internet crypto-protocol

More information

TOPIC HIERARCHY. Distributed Environment. Security. Kerberos

TOPIC HIERARCHY. Distributed Environment. Security. Kerberos KERBEROS TOPIC HIERARCHY Distributed Environment Security Privacy Authentication Authorization Non Repudiation Kerberos ORIGIN MIT developed Kerberos to protect network services. Developed under the Project

More information

Payment authorization Payment capture Table 1.3 SET Transaction Types

Payment authorization Payment capture Table 1.3 SET Transaction Types Table 1.3 lists the transaction types supported by SET. In what follows we look in some detail at the following transactions: Purchase request Payment authorization Payment capture Cardholder registration

More information

CS 356 Lecture 28 Internet Authentication. Spring 2013

CS 356 Lecture 28 Internet Authentication. Spring 2013 CS 356 Lecture 28 Internet Authentication Spring 2013 Review Chapter 1: Basic Concepts and Terminology Chapter 2: Basic Cryptographic Tools Chapter 3 User Authentication Chapter 4 Access Control Lists

More information

SYSTEM MODEL KERBEROS OBJECTIVES PHYSICAL SECURITY TRUST: CONSOLIDATED KERBEROS MODEL TRUST: BILATERAL RHOSTS MODEL

SYSTEM MODEL KERBEROS OBJECTIVES PHYSICAL SECURITY TRUST: CONSOLIDATED KERBEROS MODEL TRUST: BILATERAL RHOSTS MODEL INFS 766 Internet Security Protocols Lecture 9 WORK- STATIONS SYSTEM MODEL NETWORK SERVERS NFS GOPHER Prof. Ravi Sandhu LIBRARY KERBEROS 2 PHYSICAL SECURITY KERBEROS OBJECTIVES CLIENT WORKSTATIONS None,

More information

Leverage Active Directory with Kerberos to Eliminate HTTP Password

Leverage Active Directory with Kerberos to Eliminate HTTP Password Leverage Active Directory with Kerberos to Eliminate HTTP Password PistolStar, Inc. PO Box 1226 Amherst, NH 03031 USA Phone: 603.547.1200 Fax: 603.546.2309 E-mail: salesteam@pistolstar.com Website: www.pistolstar.com

More information

Federated Identity and Single-Sign On

Federated Identity and Single-Sign On CS 6393 Lecture 5 Federated Identity and Single-Sign On Prof. Ravi Sandhu Executive Director and Endowed Chair February 15, 2013 ravi.sandhu@utsa.edu www.profsandhu.com Ravi Sandhu 1 The Web Today User

More information

Architecture of Enterprise Applications III Single Sign-On

Architecture of Enterprise Applications III Single Sign-On Architecture of Enterprise Applications III Single Sign-On Haopeng Chen REliable, INtelligent and Scalable Systems Group (REINS) Shanghai Jiao Tong University Shanghai, China e-mail: chen-hp@sjtu.edu.cn

More information

Chapter 16: Authentication in Distributed System

Chapter 16: Authentication in Distributed System Chapter 16: Authentication in Distributed System Ajay Kshemkalyani and Mukesh Singhal Distributed Computing: Principles, Algorithms, and Systems Cambridge University Press A. Kshemkalyani and M. Singhal

More information

2015-11-02. Electronic Payments Part 1

2015-11-02. Electronic Payments Part 1 Electronic Payments Part Card transactions Card-Present Smart Cards Card-Not-Present SET 3D Secure Untraceable E-Cash Micropayments Payword Electronic Lottery Tickets Peppercoin Bitcoin EITN4 - Advanced

More information

Module 8. Network Security. Version 2 CSE IIT, Kharagpur

Module 8. Network Security. Version 2 CSE IIT, Kharagpur Module 8 Network Security Lesson 2 Secured Communication Specific Instructional Objectives On completion of this lesson, the student will be able to: State various services needed for secured communication

More information

Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 15.1

Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 15.1 Chapter 15 Key Management Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 15.1 Symmetric-key Distribution Symmetric-key cryptography is more efficient than asymmetric-key

More information

Chapter 17. Transport-Level Security

Chapter 17. Transport-Level Security Chapter 17 Transport-Level Security Web Security Considerations The World Wide Web is fundamentally a client/server application running over the Internet and TCP/IP intranets The following characteristics

More information

CSE331: Introduction to Networks and Security. Lecture 29 Fall 2006

CSE331: Introduction to Networks and Security. Lecture 29 Fall 2006 CSE331: Introduction to Networks and Security Lecture 29 Fall 2006 Announcements Project 3 is due Today Can submit electronically (mail savi@seas) By midnight Project 4 will be on the web this afternoon

More information

Web Payment Security. A discussion of methods providing secure communication on the Internet. Zhao Huang Shahid Kahn

Web Payment Security. A discussion of methods providing secure communication on the Internet. Zhao Huang Shahid Kahn Web Payment Security A discussion of methods providing secure communication on the Internet Group Members: Peter Heighton Zhao Huang Shahid Kahn 1. Introduction Within this report the methods taken to

More information

Using etoken for SSL Web Authentication. SSL V3.0 Overview

Using etoken for SSL Web Authentication. SSL V3.0 Overview Using etoken for SSL Web Authentication Lesson 12 April 2004 etoken Certification Course SSL V3.0 Overview Secure Sockets Layer protocol, version 3.0 Provides communication privacy over the internet. Prevents

More information

Take-home points. Distributed Systems Security II. Remember digital signatures. Today: Auth protocols 15-440

Take-home points. Distributed Systems Security II. Remember digital signatures. Today: Auth protocols 15-440 Distributed Systems Security II 5-440 Take-home points What does using public-key for our authentication buy us? Compare kerberos (needham-schroeder) and SSL with a certificate authority Metrics: Scaling,

More information

This chapter describes how to use the Junos Pulse Secure Access Service in a SAML single sign-on deployment. It includes the following sections:

This chapter describes how to use the Junos Pulse Secure Access Service in a SAML single sign-on deployment. It includes the following sections: CHAPTER 1 SAML Single Sign-On This chapter describes how to use the Junos Pulse Secure Access Service in a SAML single sign-on deployment. It includes the following sections: Junos Pulse Secure Access

More information

Kerberos-Based Authentication for OpenStack Cloud Infrastructure as a Service

Kerberos-Based Authentication for OpenStack Cloud Infrastructure as a Service Kerberos-Based Authentication for OpenStack Cloud Infrastructure as a Service Sazzad Masud and Ram Krishnan University of Texas at San Antonio Sazzad.Masud@gmail.com, Ram.Krishnan@utsa.edu Abstract Cloud

More information

Attestation and Authentication Protocols Using the TPM

Attestation and Authentication Protocols Using the TPM Attestation and Authentication Protocols Using the TPM Ariel Segall June 21, 2011 Approved for Public Release: 11-2876. Distribution Unlimited. c 2011. All Rights Reserved. (1/28) Motivation Almost all

More information

WEB Security & SET. Outline. Web Security Considerations. Web Security Considerations. Secure Socket Layer (SSL) and Transport Layer Security (TLS)

WEB Security & SET. Outline. Web Security Considerations. Web Security Considerations. Secure Socket Layer (SSL) and Transport Layer Security (TLS) Outline WEB Security & SET (Chapter 19 & Stalling Chapter 7) Web Security Considerations Secure Socket Layer (SSL) and Transport Layer Security (TLS) Secure Electronic Transaction (SET) Web Security Considerations

More information

Network Security [2] Plain text Encryption algorithm Public and private key pair Cipher text Decryption algorithm. See next slide

Network Security [2] Plain text Encryption algorithm Public and private key pair Cipher text Decryption algorithm. See next slide Network Security [2] Public Key Encryption Also used in message authentication & key distribution Based on mathematical algorithms, not only on operations over bit patterns (as conventional) => much overhead

More information

Cryptography and Network Security

Cryptography and Network Security Cryptography and Network Security Spring 2012 http://users.abo.fi/ipetre/crypto/ Lecture 9: Authentication protocols, digital signatures Ion Petre Department of IT, Åbo Akademi University 1 Overview of

More information

What is network security?

What is network security? Network security Network Security Srinidhi Varadarajan Foundations: what is security? cryptography authentication message integrity key distribution and certification Security in practice: application

More information

Scenario. Roadmap. ! The simplified architecture! The complete architecture Pre-authentication Delegation. Realms

Scenario. Roadmap. ! The simplified architecture! The complete architecture Pre-authentication Delegation. Realms erberos' erberos! erberos is based on the Needham-Schroeder protocol (1978)! erberos was developed at MIT in1980! erberos V4 and erberos V5 (RFC 1510)! erberos if part of OSF DCE and Windows 2 (e later)!

More information

Key Management and Distribution

Key Management and Distribution Key Management and Distribution Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-11/

More information

4.2: Kerberos Kerberos V4 Kerberos V5. Chapter 5: Security Concepts for Networks. Lehrstuhl für Informatik 4 Kommunikation und verteilte Systeme

4.2: Kerberos Kerberos V4 Kerberos V5. Chapter 5: Security Concepts for Networks. Lehrstuhl für Informatik 4 Kommunikation und verteilte Systeme Chapter 2: Security Techniques Background Chapter 3: Security on Network and Transport Layer Chapter 4: Security on the Application Layer Secure Applications Network Authentication Service: Kerberos 4.2:

More information

Authentication is not Authorization?! And what is a "digital signature" anyway?

Authentication is not Authorization?! And what is a digital signature anyway? Authentication is not Authorization?! And what is a "digital signature" anyway? Prepared by R. David Vernon Revised 12/01 Introduction REV 1A As part of the IT Architecture Initiative, the Office of Information

More information

Kerberos. Login via Password. Keys in Kerberos

Kerberos. Login via Password. Keys in Kerberos Kerberos Chapter 2: Security Techniques Background Chapter 3: Security on Network and Transport Layer Chapter 4: Security on the Application Layer Secure Applications Network Authentication Service: Kerberos

More information

Kerberos. Public domain image of Heracles and Cerberus. From an Attic bilingual amphora, 530 520 BC. From Italy (?).

Kerberos. Public domain image of Heracles and Cerberus. From an Attic bilingual amphora, 530 520 BC. From Italy (?). Kerberos Public domain image of Heracles and Cerberus. From an Attic bilingual amphora, 530 520 BC. From Italy (?). 1 Kerberos Kerberos is an authentication protocol and a software suite implementing this

More information

"When you have crossed the river and have advanced a little further, some aged women weaving at the loom will beg you to lend a hand for a short

When you have crossed the river and have advanced a little further, some aged women weaving at the loom will beg you to lend a hand for a short KERBEROS: the fierce watchdog of Haides, depicted as a three headed dog with a serpent's tail, a mane of snakes, and a lion's claws. "And before them a dreaded hound, on watch, who has no pity, but a vile

More information

Cryptography and Network Security Sicurezza delle reti e dei sistemi informatici SSL/TSL

Cryptography and Network Security Sicurezza delle reti e dei sistemi informatici SSL/TSL Cryptography and Network Security Sicurezza delle reti e dei sistemi informatici SSL/TSL Security architecture and protocol stack Applicat. (SHTTP) SSL/TLS TCP IPSEC IP Secure applications: PGP, SHTTP,

More information

UNI Login. Authentication

UNI Login. Authentication UNI Login Authentication UNI C februar 2012 UNI Login Authentication UNI C februar 2012 Authentication with UNI Login 1 Index 1 Authentication with UNI Login... 2 1.1 How does it work?... 2 1.2 How does

More information

1. a. Define the properties of a one-way hash function. (6 marks)

1. a. Define the properties of a one-way hash function. (6 marks) 1. a. Define the properties of a one-way hash function. (6 marks) A hash function h maps arbitrary length value x to fixed length value y such that: Hard to reverse. Given value y not feasible to find

More information

Introduction to Network Security Key Management and Distribution

Introduction to Network Security Key Management and Distribution Introduction to Network Security Key Management and Distribution Egemen K. Çetinkaya Department of Electrical & Computer Engineering Missouri University of Science and Technology cetinkayae@mst.edu http://web.mst.edu/~cetinkayae/teaching/cpe5420fall2015

More information

Client Server Registration Protocol

Client Server Registration Protocol Client Server Registration Protocol The Client-Server protocol involves these following steps: 1. Login 2. Discovery phase User (Alice or Bob) has K s Server (S) has hash[pw A ].The passwords hashes are

More information

Kerberos and Single Sign-On with HTTP

Kerberos and Single Sign-On with HTTP Kerberos and Single Sign-On with HTTP Joe Orton Red Hat Introduction The Problem Current Solutions Future Solutions Conclusion Overview Introduction WebDAV: common complaint of poor support for authentication

More information

Kerberos and Active Directory symmetric cryptography in practice COSC412

Kerberos and Active Directory symmetric cryptography in practice COSC412 Kerberos and Active Directory symmetric cryptography in practice COSC412 Learning objectives Understand the function of Kerberos Explain how symmetric cryptography supports the operation of Kerberos Summarise

More information

Network Security Standards. Key distribution Kerberos SSL/TLS

Network Security Standards. Key distribution Kerberos SSL/TLS Network Security Standards Key distribution Kerberos SSL/TLS 1 Many-to-Many Authentication? Users Servers How do users prove their identities when requesting services from machines on the network? Naïve

More information

Part III-b. Universität Klagenfurt - IWAS Multimedia Kommunikation (VK) M. Euchner; Mai 2001. Siemens AG 2001, ICN M NT

Part III-b. Universität Klagenfurt - IWAS Multimedia Kommunikation (VK) M. Euchner; Mai 2001. Siemens AG 2001, ICN M NT Part III-b Contents Part III-b Secure Applications and Security Protocols Practical Security Measures Internet Security IPSEC, IKE SSL/TLS Virtual Private Networks Firewall Kerberos SET Security Measures

More information

Single sign-on enabled OpenCms

Single sign-on enabled OpenCms Single sign-on enabled OpenCms Architecture for Single sign-on implementation into OpenCms Pavel Slavíček, pavel.slavicek@qbizm.cz Brno, The Czech Republic, 2. 5. 2008 Content Single sign-on introduction

More information

Key Management and Distribution

Key Management and Distribution Key Management and Distribution Overview Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu udio/video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-14/

More information

Kerberos: An Authentication Service for Computer Networks by Clifford Neuman and Theodore Ts o. Presented by: Smitha Sundareswaran Chi Tsong Su

Kerberos: An Authentication Service for Computer Networks by Clifford Neuman and Theodore Ts o. Presented by: Smitha Sundareswaran Chi Tsong Su Kerberos: An Authentication Service for Computer Networks by Clifford Neuman and Theodore Ts o Presented by: Smitha Sundareswaran Chi Tsong Su Introduction Kerberos: An authentication protocol based on

More information

Computer Systems Security 2013/2014. Single Sign-On. Bruno Maia ei09095@fe.up.pt. Pedro Borges ei09063@fe.up.pt

Computer Systems Security 2013/2014. Single Sign-On. Bruno Maia ei09095@fe.up.pt. Pedro Borges ei09063@fe.up.pt Computer Systems Security 2013/2014 Single Sign-On Bruno Maia ei09095@fe.up.pt Pedro Borges ei09063@fe.up.pt December 13, 2013 Contents 1 Introduction 2 2 Explanation of SSO systems 2 2.1 OpenID.................................

More information

Two SSO Architectures with a Single Set of Credentials

Two SSO Architectures with a Single Set of Credentials Two SSO Architectures with a Single Set of Credentials Abstract Single sign-on (SSO) is a widely used mechanism that uses a single action of authentication and authority to permit an authorized user to

More information

OpenHRE Security Architecture. (DRAFT v0.5)

OpenHRE Security Architecture. (DRAFT v0.5) OpenHRE Security Architecture (DRAFT v0.5) Table of Contents Introduction -----------------------------------------------------------------------------------------------------------------------2 Assumptions----------------------------------------------------------------------------------------------------------------------2

More information

Part 2 D(E(M, K),K ) E(M, K) E(M, K) Plaintext M. Plaintext M. Decrypt with private key. Encrypt with public key. Ciphertext

Part 2 D(E(M, K),K ) E(M, K) E(M, K) Plaintext M. Plaintext M. Decrypt with private key. Encrypt with public key. Ciphertext Part 2 Plaintext M Encrypt with public key E(M, K) Ciphertext Plaintext M D(E(M, K),K ) Decrypt with private key E(M, K) Public and private key related mathematically Public key can be published; private

More information

10.2 World Wide Web Security S-HTTP (secure hypertext transfer protocol) SEA (security extension architecture)

10.2 World Wide Web Security S-HTTP (secure hypertext transfer protocol) SEA (security extension architecture) Contents 1 / 55 10.1 Kerberos Kerberos V4 Kerberos V5 10.2 World Wide Web Security S-HTTP (secure hypertext transfer protocol) SEA (security extension architecture) Kerberos V4 / Contents 2 / 55 Kerberos

More information

Using Foundstone CookieDigger to Analyze Web Session Management

Using Foundstone CookieDigger to Analyze Web Session Management Using Foundstone CookieDigger to Analyze Web Session Management Foundstone Professional Services May 2005 Web Session Management Managing web sessions has become a critical component of secure coding techniques.

More information

Chair for Network Architectures and Services Institute of Informatics TU München Prof. Carle. Network Security. Chapter 3

Chair for Network Architectures and Services Institute of Informatics TU München Prof. Carle. Network Security. Chapter 3 Chair for Network Architectures and Services Institute of Informatics TU München Prof. Carle Network Security Chapter 3 Cryptographic Protocols for Encryption, Authentication and Key Establishment Overview

More information

10 Secure Electronic Transactions: Overview, Capabilities, and Current Status

10 Secure Electronic Transactions: Overview, Capabilities, and Current Status 10 Secure Electronic Transactions: Overview, Capabilities, and Current Status Gordon Agnew A&F Consulting, and University of Waterloo, Ontario, Canada 10.1 Introduction Until recently, there were two primary

More information

Key Management. CSC 490 Special Topics Computer and Network Security. Dr. Xiao Qin. Auburn University http://www.eng.auburn.edu/~xqin xqin@auburn.

Key Management. CSC 490 Special Topics Computer and Network Security. Dr. Xiao Qin. Auburn University http://www.eng.auburn.edu/~xqin xqin@auburn. CSC 490 Special Topics Computer and Network Security Key Management Dr. Xiao Qin Auburn University http://www.eng.auburn.edu/~xqin xqin@auburn.edu Slide 09-1 Overview Key exchange Session vs. interchange

More information

Authentication Types. Password-based Authentication. Off-Line Password Guessing

Authentication Types. Password-based Authentication. Off-Line Password Guessing Authentication Types Chapter 2: Security Techniques Background Secret Key Cryptography Public Key Cryptography Hash Functions Authentication Chapter 3: Security on Network and Transport Layer Chapter 4:

More information

Single Sign-on (SSO) technologies for the Domino Web Server

Single Sign-on (SSO) technologies for the Domino Web Server Single Sign-on (SSO) technologies for the Domino Web Server Jane Marcus December 7, 2011 2011 IBM Corporation Welcome Participant Passcode: 4297643 2011 IBM Corporation 2 Agenda USA Toll Free (866) 803-2145

More information

Q: Why security protocols?

Q: Why security protocols? Security Protocols Q: Why security protocols? Alice Bob A: To allow reliable communication over an untrusted channel (eg. Internet) 2 Security Protocols are out there Confidentiality Authentication Example:

More information

Webmail Using the Hush Encryption Engine

Webmail Using the Hush Encryption Engine Webmail Using the Hush Encryption Engine Introduction...2 Terms in this Document...2 Requirements...3 Architecture...3 Authentication...4 The Role of the Session...4 Steps...5 Private Key Retrieval...5

More information

IMPLEMENTING SINGLE SIGN- ON USING SAML 2.0 ON JUNIPER NETWORKS MAG SERIES JUNOS PULSE GATEWAYS

IMPLEMENTING SINGLE SIGN- ON USING SAML 2.0 ON JUNIPER NETWORKS MAG SERIES JUNOS PULSE GATEWAYS APPLICATION NOTE IMPLEMENTING SINGLE SIGN- ON USING SAML 2.0 ON JUNIPER NETWORKS MAG SERIES JUNOS PULSE GATEWAYS SAML 2.0 combines encryption and digital signature verification across resources for a more

More information

CSCI 454/554 Computer and Network Security. Final Exam Review

CSCI 454/554 Computer and Network Security. Final Exam Review CSCI 454/554 Computer and Network Security Final Exam Review Topics covered by Final Topic before Midterm 20% Topic after Midterm 80% Date: 05/13/2015 9:00am noon Place: the same classroom Open book/notes

More information

IceWarp Server - SSO (Single Sign-On)

IceWarp Server - SSO (Single Sign-On) IceWarp Server - SSO (Single Sign-On) Probably the most difficult task for me is to explain the new SSO feature of IceWarp Server. The reason for this is that I have only little knowledge about it and

More information

2.4: Authentication Authentication types Authentication schemes: RSA, Lamport s Hash Mutual Authentication Session Keys Trusted Intermediaries

2.4: Authentication Authentication types Authentication schemes: RSA, Lamport s Hash Mutual Authentication Session Keys Trusted Intermediaries Chapter 2: Security Techniques Background Secret Key Cryptography Public Key Cryptography Hash Functions Authentication Chapter 3: Security on Network and Transport Layer Chapter 4: Security on the Application

More information

CA SiteMinder SSO Agents for ERP Systems

CA SiteMinder SSO Agents for ERP Systems PRODUCT SHEET: CA SITEMINDER SSO AGENTS FOR ERP SYSTEMS CA SiteMinder SSO Agents for ERP Systems CA SiteMinder SSO Agents for ERP Systems help organizations minimize sign-on requirements and increase security

More information

JVA-122. Secure Java Web Development

JVA-122. Secure Java Web Development JVA-122. Secure Java Web Development Version 7.0 This comprehensive course shows experienced developers of Java EE applications how to secure those applications and to apply best practices with regard

More information

SECURITY IMPLEMENTATION IN HADOOP. By Narsimha Chary(200607008) Siddalinga K M(200950034) Rahman(200950032)

SECURITY IMPLEMENTATION IN HADOOP. By Narsimha Chary(200607008) Siddalinga K M(200950034) Rahman(200950032) SECURITY IMPLEMENTATION IN HADOOP By Narsimha Chary(200607008) Siddalinga K M(200950034) Rahman(200950032) AGENDA What is security? Security in Distributed File Systems? Current level of security in Hadoop!

More information

A Secure Authenticate Framework for Cloud Computing Environment

A Secure Authenticate Framework for Cloud Computing Environment A Secure Authenticate Framework for Cloud Computing Environment Nitin Nagar 1, Pradeep k. Jatav 2 Abstract Cloud computing has an important aspect for the companies to build and deploy their infrastructure

More information

SECURITY IN ELECTRONIC COMMERCE MULTIPLE-CHOICE QUESTIONS

SECURITY IN ELECTRONIC COMMERCE MULTIPLE-CHOICE QUESTIONS MULTIPLE-CHOICE QUESTIONS Each question has only one correct answer, which ought to be clearly pointed out with an 'X'. Each question incorrectly answered will be evaluated as minus one third of the mark

More information

A method to Implement the Kerberos User. Authentication and the secured Internet Service

A method to Implement the Kerberos User. Authentication and the secured Internet Service A method to Implement the Kerberos User Authentication and the secured Internet Service Pak Song-Ho, Pak Myong-Suk,Jang Chung-Hyok Kim Il Sung University, Pyongyang, DPR of Korea Abstract This paper proposes

More information

External Authentication with WebCT. What We ll Discuss

External Authentication with WebCT. What We ll Discuss External Authentication with WebCT WebCT, Inc http://www.webct.com/ What We ll Discuss Introductions Terminology Authentication in WebCT External Authentication Custom Authentication Authorization in WebCT

More information

Prepared by Enea S.Teresa (Italy) Version 1.0 2006-October 24

Prepared by Enea S.Teresa (Italy) Version 1.0 2006-October 24 Mersea Information System: an Authentication and Authorization System to access distributed oceanographic data. Prepared by Enea S.Teresa (Italy) Version 1.0 2006-October 24 Revision History Date Version

More information

Secure Sockets Layer (SSL) / Transport Layer Security (TLS)

Secure Sockets Layer (SSL) / Transport Layer Security (TLS) Secure Sockets Layer (SSL) / Transport Layer Security (TLS) Brad Karp UCL Computer Science CS GZ03 / M030 19 th November 2014 What Problems Do SSL/TLS Solve? Two parties, client and server, not previously

More information

Web Security. Mahalingam Ramkumar

Web Security. Mahalingam Ramkumar Web Security Mahalingam Ramkumar Issues Phishing Spreading misinformation Cookies! Authentication Domain name DNS Security Transport layer security Dynamic HTML Java applets, ActiveX, JavaScript Exploiting

More information

Guide to SASL, GSSAPI & Kerberos v.6.0

Guide to SASL, GSSAPI & Kerberos v.6.0 SYMLABS VIRTUAL DIRECTORY SERVER Guide to SASL, GSSAPI & Kerberos v.6.0 Copyright 2011 www.symlabs.com Chapter 1 Introduction Symlabs has added support for the GSSAPI 1 authentication mechanism, which

More information

International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), INTERNATIONAL JOURNAL OF COMPUTER ENGINEERING &

International Journal of Computer Engineering and Technology (IJCET), ISSN 0976-6367(Print), INTERNATIONAL JOURNAL OF COMPUTER ENGINEERING & INTERNATIONAL JOURNAL OF COMPUTER ENGINEERING & TECHNOLOGY (IJCET) ISSN 0976 6367(Print) ISSN 0976 6375(Online) Volume 4, Issue 6, November - December (2013), pp. 62-69 IAEME: www.iaeme.com/ijcet.asp Journal

More information

Electronic Payments. EITN40 - Advanced Web Security

Electronic Payments. EITN40 - Advanced Web Security Electronic Payments EITN40 - Advanced Web Security 1 Card transactions Card-Present Smart Cards Card-Not-Present SET 3D Secure Untraceable E-Cash Micropayments Payword Electronic Lottery Tickets Peppercoin

More information

Visa/MasterCard Secure Electronic Transactions (SET) Scope of SET Protocols

Visa/MasterCard Secure Electronic Transactions (SET) Scope of SET Protocols Visa/MasterCard Secure Electronic Transactions (SET) Specification of the Official method of achieving network payment via Credit Cards Announced in February 1996 Supported by Visa, MasterCard, GTE, IBM,

More information

Web Single Sign-On System. For WRL Company

Web Single Sign-On System. For WRL Company 1 Web Single Sign-On System For WRL Company Si Xiong June 2005 Department of Internetworking Royal Institute of Technology (KTH), IT-University Stockholm, Sweden Master of Science Thesis Supervisor: Johan

More information

Security: Focus of Control. Authentication

Security: Focus of Control. Authentication Security: Focus of Control Three approaches for protection against security threats a) Protection against invalid operations b) Protection against unauthorized invocations c) Protection against unauthorized

More information

How to Create E-Commerce Web Site

How to Create E-Commerce Web Site How to Create E-Commerce Web Site By A. Sittikorn Direksoonthorn BIS 3687: E-Banking and Payment System Assumption University 1/2004 Be on the Web, or Be out of Business Quick Win Agenda Encryption in

More information

A mobile single sign on system

A mobile single sign on system A mobile single sign on system Mats Byfuglien 2006/1/6 Abstract Today users have to manage a set of username, passwords for every service they are using. As the number of passwords to mange grow, people

More information

Payment Systems for E-Commerce. Shengyu Jin 4/27/2005

Payment Systems for E-Commerce. Shengyu Jin 4/27/2005 Payment Systems for E-Commerce Shengyu Jin 4/27/2005 Reference Papers 1. Research on electronic payment model,2004 2. An analysis and comparison of different types of electronic payment systems 2001 3.

More information

Key Management (Distribution and Certification) (1)

Key Management (Distribution and Certification) (1) Key Management (Distribution and Certification) (1) Remaining problem of the public key approach: How to ensure that the public key received is really the one of the sender? Illustration of the problem

More information

Standards and Products. Computer Security. Kerberos. Kerberos

Standards and Products. Computer Security. Kerberos. Kerberos 3 4 Standards and Products Computer Security Standards and Products Public Key Infrastructure (PKI) IPsec SSL/TLS Electronic Mail Security: PEM, S/MIME, and PGP March 24, 2004 2004, Bryan J. Higgs 1 2

More information

Network Security. Computer Networking Lecture 08. March 19, 2012. HKU SPACE Community College. HKU SPACE CC CN Lecture 08 1/23

Network Security. Computer Networking Lecture 08. March 19, 2012. HKU SPACE Community College. HKU SPACE CC CN Lecture 08 1/23 Network Security Computer Networking Lecture 08 HKU SPACE Community College March 19, 2012 HKU SPACE CC CN Lecture 08 1/23 Outline Introduction Cryptography Algorithms Secret Key Algorithm Message Digest

More information

Public Key Applications & Usage A Brief Insight

Public Key Applications & Usage A Brief Insight Public Key Applications & Usage A Brief Insight Scenario :: Identification, Authentication & Non- Repudiation :: Confidentiality :: Authenticity, requirements and e-business Integrity for electronic transaction

More information

FAME-PERMIS Project Output WORKPACKAGE 1 Deliverable D1. Report on the Design of FAME Architecture and Components

FAME-PERMIS Project Output WORKPACKAGE 1 Deliverable D1. Report on the Design of FAME Architecture and Components FAME-PERMIS Project Output WORKPACKAGE 1 Deliverable D1 Report on the Design of FAME Architecture and Components Aleksandra Nenadić Ning Zhang Alan Rector Carole Goble School of Computer Science University

More information

Password Power 8 Plug-In for Lotus Domino Single Sign-On via Kerberos

Password Power 8 Plug-In for Lotus Domino Single Sign-On via Kerberos Password Power 8 Plug-In for Lotus Domino Single Sign-On via Kerberos PistolStar, Inc. PO Box 1226 Amherst, NH 03031 USA Phone: 603.547.1200 Fax: 603.546.2309 E-mail: salesteam@pistolstar.com Website:

More information

Single Sign-On for Kerberized Linux and UNIX Applications

Single Sign-On for Kerberized Linux and UNIX Applications Likewise Enterprise Single Sign-On for Kerberized Linux and UNIX Applications AUTHOR: Manny Vellon Chief Technology Officer Likewise Software Abstract This document describes how Likewise facilitates the

More information

Chapter 8. Network Security

Chapter 8. Network Security Chapter 8 Network Security Cryptography Introduction to Cryptography Substitution Ciphers Transposition Ciphers One-Time Pads Two Fundamental Cryptographic Principles Need for Security Some people who

More information

INTEGRATION GUIDE. IDENTIKEY Federation Server for Juniper SSL-VPN

INTEGRATION GUIDE. IDENTIKEY Federation Server for Juniper SSL-VPN INTEGRATION GUIDE IDENTIKEY Federation Server for Juniper SSL-VPN Disclaimer Disclaimer of Warranties and Limitation of Liabilities All information contained in this document is provided 'as is'; VASCO

More information

Secure Authentication and Session. State Management for Web Services

Secure Authentication and Session. State Management for Web Services Lehman 0 Secure Authentication and Session State Management for Web Services Clay Lehman CSC 499: Honors Thesis Supervised by: Dr. R. Michael Young Lehman 1 1. Introduction Web services are a relatively

More information

Copyright Warning & Restrictions

Copyright Warning & Restrictions Copyright Warning & Restrictions The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. Under certain conditions

More information