Security Sensor Network. Biswajit panja

Size: px
Start display at page:

Download "Security Sensor Network. Biswajit panja"

Transcription

1 Security Sensor Network Biswajit panja 1

2 Topics Security Issues in Wired Network Security Issues in Wireless Network Security Issues in Sensor Network 2

3 Security Issues in Wired Network 3

4 Security Attacks Source: Network Security Essentials, William Stallings 4

5 Conventional Encryption Principles An encryption scheme has five ingredients: Plaintext Encryption algorithm Secret Key Ciphertext Decryption algorithm Security depends on the secrecy of the key, not the secrecy of the algorithm Source: Network Security Essentials, William Stallings 5

6 Conventional Encryption Principles Source: Network Security Essentials, William Stallings 6

7 Average time required for exhaustive key search Key Size (bits) Number of Alternative Keys = 4.3 x = 7.2 x = 3.4 x = 3.7 x Time required at 10 6 Decryption/µs 2.15 milliseconds 10 hours 5.4 x years 5.9 x years Source: Network Security Essentials, William Stallings 7

8 Symmetric Block Ciphers DEA TDEA International Data Encryption Blowfish Source: Network Security Essentials, William Stallings 8

9 Source: Network Security Essentials, William Stallings 9

10 Key Distribution 1. A key could be selected by A and physically delivered to B. 2. A third party could select the key and physically deliver it to A and B. 3. If A and B have previously used a key, one party could transmit the new key to the other, encrypted using the old key. 4. If A and B each have an encrypted connection to a third party C, C could deliver a key on the encrypted links to A and B. Session key: Data encrypted with a one-time session key. At the conclusion of the session the key is destroyed Permanent key: Used between entities for the purpose of distributing session keys Source: Network Security Essentials, William Stallings 10

11 Source: Network Security Essentials, William Stallings 11

12 Encryption using Public-Key system Source: Network Security Essentials, William Stallings 12

13 Authentication using Public-Key System Source: Network Security Essentials, William Stallings 13

14 Applications for Public-Key Cryptosystems Three categories: Encryption/decryption: The sender encrypts a message with the recipient s public key. Digital signature: The sender signs a message with its private key. Key exhange: Two sides cooperate two exhange a session key. Source: Network Security Essentials, William Stallings 14

15 The RSA Algorithm Key Generation 1. Select p,q 2. Calculate n = p x q 3. Calculate Φ( n) = ( p 1)( q 4. Select integer e 5. Calculate d d 6. Public Key 7. Private key p and q both prime 1) gcd( Φ( n), e) = 1;1 < e 1 = e mod Φ( n) KU = {e,n} KR = {d,n} < Φ( n) Source: Network Security Essentials, William Stallings 15

16 Diffie-Hellman Key Echange Source: Network Security Essentials, William Stallings 16

17 Key Management Public-Key Certificate Use Source: Network Security Essentials, William Stallings 17

18 Authentication Applications: Kerberos Source: Network Security Essentials, William Stallings 18

19 IP Security Scenario Source: Network Security Essentials, William Stallings 19

20 End-to to-end versus End-to to- Intermediate Authentication Source: Network Security Essentials, William Stallings 20

21 Source: Network Security Essentials, William Stallings 21

22 Distributed Intrusion Detection Source: Network Security Essentials, William Stallings 22

23 Distributed Intrusion Detection Source: Network Security Essentials, William Stallings 23

24 Security Issues in Wireless Network

25 Attacks Attacks could range from deleting messages, injecting erroneous messages, impersonate a node. Poor physical protection Attacks not only from outside but also from within the network from compromised nodes 25

26 Key Management and Routing A single key management service for an Ad-hoc network is not a good idea - CA may be down/unavailable - CA compromises Secure routing is an issue with dynamically changing network. False routing information generated by compromised nodes 26

27 Used key agreement Certificate based key agreement public key certificates can allow participants to verify the binding between the IP address and keys of other participants. Disadvantage - Difficult to determine if the certificate presented by the participant has been revoked 27

28 Password based Authenticated Key Exchange Password is chosen and shared among the nodes Desirable properties:-secrecy, Perfect Forward Secrecy, Contributory key agreement, Tolerance to disruption attempts Protocol:- Diffie-Hellman 28

29 Problems associated with Ad-hoc Routing Frequent changes in network topology Problems associated with wireless communication Trust relationship between neighbors Throughput Attacks using modification of protocol fields of messages 29

30 Some Approaches Using pre-deployed security infrastructure Using independent Security Agents (SA) Installing extra facilities in the network to mitigate routing misbehavior 30

31 Security Issues in Sensor Network

32 Requirements Confidentiality Authenticity Integrity Freshness Scalability Availability Accessibility Self-Organization Flexibility Source: Constraints and approaches for distributed network security, NAI Lab 32

33 Sensor Node Constraints Battery Power/Energy - Computational Energy Consumption - Communications Energy Consumption Rechargeability Sleep Patterns Transmission Range Memory - Program Storage and Working Memory - Programmable Storage for Security Information Location Sensing Tamper Protection Time Unattended Operations Source: Constraints and approaches for distributed network security, NAI Lab 33

34 Networking Constraints Ad hoc Networking Limited Pre-Configuration Data Rate/Packet Size Channel error rate Intermittent connectivity Unreliable communications Latency Unicast vs. multicast Unidirectional Communications Isolated subgroups Frequent Routing Changes Population Density Unknown Recipients Source: Constraints and approaches for distributed network security, NAI Lab 34

35 Sensor Network Encryption Protocol (SNEP) E = {D}{ (kencr,, c), M=MAC(kmac MAC(kmac, c {D} (kencr,c kencr,c) ) A->B: {D}{ (kencr,, c), M=MAC(kmac MAC(kmac, c {D} (kencr,c kencr,c) ) Advantages: - Semantic security: Same message get encrypted differently because of counter - Data authentication: MAC verifies - Low communication overhead Source: SPINS: Security protocol for sensor network 35

36 Micro TESLA Delayed disclosure of symmetric keys. Sender computes a MAC with message and a secret key. Receiver node stores the msg with MAC in buffer, not the key yet. K i = F(K i+1 ) Source: SPINS: Security protocol for sensor network 36

37 Micro TESLA Each key corresponds to a time interval, and packets send in that interval used that key. F F F K0 K1 K2 K3 Time K0 = F(F(k2)), If key lost it can be calculated using the function. So, the packets can be authenticated using the key. Source: SPINS: Security protocol for sensor network 37

38 Flat Architecture Cluster head Relay nodes M1 M2 Mn Mn-1 M3 Mn-2 38

39 Higher level cluster head makes a decision after Collecting group data Reports to higher level Cluster head Report to cluster head Removes dup data (1,0) (1,1) (2,0) (2,1) (2,2) (1,2) (2,3) (2,4) (1,0) (2,1) (2,0) (2,2) (1,0) (2,1) (2,0) (2,2) group

40 Multi party Diffie-Hellman g s1s2s3s4 M10 Cluster head g s4s5s6s11 M11 gs1s s13 Broadcast M12 g s7s8s9s12 Session Key g s1 M1 g s2 M2 g s3 M3 g s4 M4 g s5 g s6 M6 M5 g s7 M7 g s8 M8 g s9 M9

41 Another approach 41

42 Questions?

Wireless Network Security 14-814 Spring 2014

Wireless Network Security 14-814 Spring 2014 Wireless Network Security 14-814 Spring 2014 Patrick Tague Class #8 Broadcast Security & Key Mgmt 1 Announcements 2 Broadcast Communication Wireless networks can leverage the broadcast advantage property

More information

SPINS: Security Protocols for Sensor Networks

SPINS: Security Protocols for Sensor Networks SPINS: Security Protocols for Sensor Networks Adrian Perrig, Robert Szewczyk, J.D. Tygar, Victor Wen, and David Culler Department of Electrical Engineering & Computer Sciences, University of California

More information

15 th TF-Mobility Meeting Sensor Networks. Torsten Braun Universität Bern braun@iam.unibe.ch www.iam.unibe.ch/~rvs

15 th TF-Mobility Meeting Sensor Networks. Torsten Braun Universität Bern braun@iam.unibe.ch www.iam.unibe.ch/~rvs 15 th TF-Mobility Meeting Sensor Networks Torsten Braun Universität Bern braun@iam.unibe.ch www.iam.unibe.ch/~rvs Overview 2 Ubiquitous Computing > Vision defined by Mark Weiser in 1991 Seamless integration

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

Chapter 9: Transport Layer and Security Protocols for Ad Hoc Wireless Networks

Chapter 9: Transport Layer and Security Protocols for Ad Hoc Wireless Networks Chapter 9: Transport Layer and Security Protocols for Ad Hoc Wireless Networks Introduction Issues Design Goals Classifications TCP Over Ad Hoc Wireless Networks Other Transport Layer Protocols Security

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

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

Security. Contents. S-72.3240 Wireless Personal, Local, Metropolitan, and Wide Area Networks 1

Security. Contents. S-72.3240 Wireless Personal, Local, Metropolitan, and Wide Area Networks 1 Contents Security requirements Public key cryptography Key agreement/transport schemes Man-in-the-middle attack vulnerability Encryption. digital signature, hash, certification Complete security solutions

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

INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY

INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY INTERNATIONAL JOURNAL OF PURE AND APPLIED RESEARCH IN ENGINEERING AND TECHNOLOGY A PATH FOR HORIZING YOUR INNOVATIVE WORK AN OVERVIEW OF MOBILE ADHOC NETWORK: INTRUSION DETECTION, TYPES OF ATTACKS AND

More information

Chapter 10. Network Security

Chapter 10. Network Security Chapter 10 Network Security 10.1. Chapter 10: Outline 10.1 INTRODUCTION 10.2 CONFIDENTIALITY 10.3 OTHER ASPECTS OF SECURITY 10.4 INTERNET SECURITY 10.5 FIREWALLS 10.2 Chapter 10: Objective We introduce

More information

Wireless Sensor Network Security. Seth A. Hellbusch CMPE 257

Wireless Sensor Network Security. Seth A. Hellbusch CMPE 257 Wireless Sensor Network Security Seth A. Hellbusch CMPE 257 Wireless Sensor Networks (WSN) 2 The main characteristics of a WSN include: Power consumption constrains for nodes using batteries or energy

More information

CS 348: Computer Networks. - Security; 30 th - 31 st Oct 2012. Instructor: Sridhar Iyer IIT Bombay

CS 348: Computer Networks. - Security; 30 th - 31 st Oct 2012. Instructor: Sridhar Iyer IIT Bombay CS 348: Computer Networks - Security; 30 th - 31 st Oct 2012 Instructor: Sridhar Iyer IIT Bombay Network security Security Plan (RFC 2196) Identify assets Determine threats Perform risk analysis Implement

More information

Network Security. Outline of the Tutorial

Network Security. Outline of the Tutorial Network Security Dr. Indranil Sen Gupta Head, School of Information Technology Professor, Computer Science & Engg. Indian Institute of Technology Kharagpur 1 Outline of the Tutorial Security attacks and

More information

12/3/08. Security in Wireless LANs and Mobile Networks. Wireless Magnifies Exposure Vulnerability. Mobility Makes it Difficult to Establish Trust

12/3/08. Security in Wireless LANs and Mobile Networks. Wireless Magnifies Exposure Vulnerability. Mobility Makes it Difficult to Establish Trust Security in Wireless LANs and Mobile Networks Wireless Magnifies Exposure Vulnerability Information going across the wireless link is exposed to anyone within radio range RF may extend beyond a room or

More information

Cryptography and Network Security Chapter 9

Cryptography and Network Security Chapter 9 Cryptography and Network Security Chapter 9 Fifth Edition by William Stallings Lecture slides by Lawrie Brown (with edits by RHB) Chapter 9 Public Key Cryptography and RSA Every Egyptian received two names,

More information

ssumathy@vit.ac.in upendra_mcs2@yahoo.com

ssumathy@vit.ac.in upendra_mcs2@yahoo.com S. Sumathy 1 and B.Upendra Kumar 2 1 School of Computing Sciences, VIT University, Vellore-632 014, Tamilnadu, India ssumathy@vit.ac.in 2 School of Computing Sciences, VIT University, Vellore-632 014,

More information

CIS 6930 Emerging Topics in Network Security. Topic 2. Network Security Primitives

CIS 6930 Emerging Topics in Network Security. Topic 2. Network Security Primitives CIS 6930 Emerging Topics in Network Security Topic 2. Network Security Primitives 1 Outline Absolute basics Encryption/Decryption; Digital signatures; D-H key exchange; Hash functions; Application of hash

More information

18-731 Midterm. Name: Andrew user id:

18-731 Midterm. Name: Andrew user id: 18-731 Midterm 6 March 2008 Name: Andrew user id: Scores: Problem 0 (10 points): Problem 1 (10 points): Problem 2 (15 points): Problem 3 (10 points): Problem 4 (20 points): Problem 5 (10 points): Problem

More information

Network Security. Security Attacks. Normal flow: Interruption: 孫 宏 民 hmsun@cs.nthu.edu.tw Phone: 03-5742968 國 立 清 華 大 學 資 訊 工 程 系 資 訊 安 全 實 驗 室

Network Security. Security Attacks. Normal flow: Interruption: 孫 宏 民 hmsun@cs.nthu.edu.tw Phone: 03-5742968 國 立 清 華 大 學 資 訊 工 程 系 資 訊 安 全 實 驗 室 Network Security 孫 宏 民 hmsun@cs.nthu.edu.tw Phone: 03-5742968 國 立 清 華 大 學 資 訊 工 程 系 資 訊 安 全 實 驗 室 Security Attacks Normal flow: sender receiver Interruption: Information source Information destination

More information

Network Security. Abusayeed Saifullah. CS 5600 Computer Networks. These slides are adapted from Kurose and Ross 8-1

Network Security. Abusayeed Saifullah. CS 5600 Computer Networks. These slides are adapted from Kurose and Ross 8-1 Network Security Abusayeed Saifullah CS 5600 Computer Networks These slides are adapted from Kurose and Ross 8-1 Public Key Cryptography symmetric key crypto v requires sender, receiver know shared secret

More information

Intrusion Detection System in MANET : A Survey

Intrusion Detection System in MANET : A Survey International Journal of Engineering and Technical Research (IJETR) ISSN: 2321-0869, Volume-2, Issue-4, April 2014 Intrusion Detection System in MANET : A Survey S.Parameswari, G.Michael Abstract MANET

More information

Network Security. Gaurav Naik Gus Anderson. College of Engineering. Drexel University, Philadelphia, PA. Drexel University. College of Engineering

Network Security. Gaurav Naik Gus Anderson. College of Engineering. Drexel University, Philadelphia, PA. Drexel University. College of Engineering Network Security Gaurav Naik Gus Anderson, Philadelphia, PA Lectures on Network Security Feb 12 (Today!): Public Key Crypto, Hash Functions, Digital Signatures, and the Public Key Infrastructure Feb 14:

More information

Lukasz Pater CMMS Administrator and Developer

Lukasz Pater CMMS Administrator and Developer Lukasz Pater CMMS Administrator and Developer EDMS 1373428 Agenda Introduction Why do we need asymmetric ciphers? One-way functions RSA Cipher Message Integrity Examples Secure Socket Layer Single Sign

More information

CSCE 465 Computer & Network Security

CSCE 465 Computer & Network Security CSCE 465 Computer & Network Security Instructor: Dr. Guofei Gu http://courses.cse.tamu.edu/guofei/csce465/ Public Key Cryptogrophy 1 Roadmap Introduction RSA Diffie-Hellman Key Exchange Public key and

More information

CRYPTOGRAPHY IN NETWORK SECURITY

CRYPTOGRAPHY IN NETWORK SECURITY ELE548 Research Essays CRYPTOGRAPHY IN NETWORK SECURITY AUTHOR: SHENGLI LI INSTRUCTOR: DR. JIEN-CHUNG LO Date: March 5, 1999 Computer network brings lots of great benefits and convenience to us. We can

More information

Overview of Cryptographic Tools for Data Security. Murat Kantarcioglu

Overview of Cryptographic Tools for Data Security. Murat Kantarcioglu UT DALLAS Erik Jonsson School of Engineering & Computer Science Overview of Cryptographic Tools for Data Security Murat Kantarcioglu Pag. 1 Purdue University Cryptographic Primitives We will discuss the

More information

AN RC4 BASED LIGHT WEIGHT SECURE PROTOCOL FOR SENSOR NETWORKS

AN RC4 BASED LIGHT WEIGHT SECURE PROTOCOL FOR SENSOR NETWORKS AN RC4 BASED LIGHT WEIGHT SECURE PROTOCOL FOR SENSOR NETWORKS Chang N. Zhang and Qian Yu Department of Computer Science, University of Regina 3737 Wascana Parkway, Regina, SK S4S 0A2 Canada {zhang, yu209}@cs.uregina.ca

More information

Information Security

Information Security Information Security Dr. Vedat Coşkun Malardalen September 15th, 2009 08:00 10:00 vedatcoskun@isikun.edu.tr www.isikun.edu.tr/~vedatcoskun What needs to be secured? With the rapid advances in networked

More information

Securing MANET Using Diffie Hellman Digital Signature Scheme

Securing MANET Using Diffie Hellman Digital Signature Scheme Securing MANET Using Diffie Hellman Digital Signature Scheme Karamvir Singh 1, Harmanjot Singh 2 1 Research Scholar, ECE Department, Punjabi University, Patiala, Punjab, India 1 Karanvirk09@gmail.com 2

More information

CS 758: Cryptography / Network Security

CS 758: Cryptography / Network Security CS 758: Cryptography / Network Security offered in the Fall Semester, 2003, by Doug Stinson my office: DC 3122 my email address: dstinson@uwaterloo.ca my web page: http://cacr.math.uwaterloo.ca/~dstinson/index.html

More information

SECURE IP MULTICASTING WITH ENCRYPTION KEY MANAGEMENT

SECURE IP MULTICASTING WITH ENCRYPTION KEY MANAGEMENT SECURE IP MULTICASTING WITH ENCRYPTION KEY MANAGEMENT Authors: Nadim Maharjan and Daryl Moten Advisor: Dr. Richard Dean Department of Electrical and Computer Engineering Morgan State University namah1@mymail.morgan.edu,

More information

SECURITY IMPROVMENTS TO THE DIFFIE-HELLMAN SCHEMES

SECURITY IMPROVMENTS TO THE DIFFIE-HELLMAN SCHEMES www.arpapress.com/volumes/vol8issue1/ijrras_8_1_10.pdf SECURITY IMPROVMENTS TO THE DIFFIE-HELLMAN SCHEMES Malek Jakob Kakish Amman Arab University, Department of Computer Information Systems, P.O.Box 2234,

More information

CSC474/574 - Information Systems Security: Homework1 Solutions Sketch

CSC474/574 - Information Systems Security: Homework1 Solutions Sketch CSC474/574 - Information Systems Security: Homework1 Solutions Sketch February 20, 2005 1. Consider slide 12 in the handout for topic 2.2. Prove that the decryption process of a one-round Feistel cipher

More information

Lecture Objectives. Lecture 8 Mobile Networks: Security in Wireless LANs and Mobile Networks. Agenda. References

Lecture Objectives. Lecture 8 Mobile Networks: Security in Wireless LANs and Mobile Networks. Agenda. References Lecture Objectives Wireless Networks and Mobile Systems Lecture 8 Mobile Networks: Security in Wireless LANs and Mobile Networks Introduce security vulnerabilities and defenses Describe security functions

More information

Wireless Sensor Networks Chapter 14: Security in WSNs

Wireless Sensor Networks Chapter 14: Security in WSNs Wireless Sensor Networks Chapter 14: Security in WSNs António Grilo Courtesy: see reading list Goals of this chapter To give an understanding of the security vulnerabilities of Wireless Sensor Networks

More information

Overview of Public-Key Cryptography

Overview of Public-Key Cryptography CS 361S Overview of Public-Key Cryptography Vitaly Shmatikov slide 1 Reading Assignment Kaufman 6.1-6 slide 2 Public-Key Cryptography public key public key? private key Alice Bob Given: Everybody knows

More information

Overview. SSL Cryptography Overview CHAPTER 1

Overview. SSL Cryptography Overview CHAPTER 1 CHAPTER 1 Note The information in this chapter applies to both the ACE module and the ACE appliance unless otherwise noted. The features in this chapter apply to IPv4 and IPv6 unless otherwise noted. Secure

More information

Implementing RSA Algorithm in MANET and Comparison with RSA Digital Signature Spinder Kaur 1, Harpreet Kaur 2

Implementing RSA Algorithm in MANET and Comparison with RSA Digital Signature Spinder Kaur 1, Harpreet Kaur 2 Implementing RSA Algorithm in MANET and Comparison with RSA Digital Signature Spinder Kaur 1, Harpreet Kaur 2 1 Research Scholar, Department of Computer Science, Doaba Group of Colleges, Kharar, Punjab,

More information

Content Teaching Academy at James Madison University

Content Teaching Academy at James Madison University Content Teaching Academy at James Madison University 1 2 The Battle Field: Computers, LANs & Internetworks 3 Definitions Computer Security - generic name for the collection of tools designed to protect

More information

SECURITY IN NETWORKS

SECURITY IN NETWORKS SECURITY IN NETWORKS GOALS Understand principles of network security: Cryptography and its many uses beyond confidentiality Authentication Message integrity Security in practice: Security in application,

More information

Symmetric Key cryptosystem

Symmetric Key cryptosystem SFWR C03: Computer Networks and Computer Security Mar 8-11 200 Lecturer: Kartik Krishnan Lectures 22-2 Symmetric Key cryptosystem Symmetric encryption, also referred to as conventional encryption or single

More information

CHAPTER 1 INTRODUCTION

CHAPTER 1 INTRODUCTION 21 CHAPTER 1 INTRODUCTION 1.1 PREAMBLE Wireless ad-hoc network is an autonomous system of wireless nodes connected by wireless links. Wireless ad-hoc network provides a communication over the shared wireless

More information

First Semester Examinations 2011/12 INTERNET PRINCIPLES

First Semester Examinations 2011/12 INTERNET PRINCIPLES PAPER CODE NO. EXAMINER : Martin Gairing COMP211 DEPARTMENT : Computer Science Tel. No. 0151 795 4264 First Semester Examinations 2011/12 INTERNET PRINCIPLES TIME ALLOWED : Two Hours INSTRUCTIONS TO CANDIDATES

More information

Chapter 9 Key Management 9.1 Distribution of Public Keys 9.1.1 Public Announcement of Public Keys 9.1.2 Publicly Available Directory

Chapter 9 Key Management 9.1 Distribution of Public Keys 9.1.1 Public Announcement of Public Keys 9.1.2 Publicly Available Directory There are actually two distinct aspects to the use of public-key encryption in this regard: The distribution of public keys. The use of public-key encryption to distribute secret keys. 9.1 Distribution

More information

Fast and Scalable Key Establishment in. Sensor Networks

Fast and Scalable Key Establishment in. Sensor Networks Fast and Scalable Key Establishment in 1 Sensor Networks Tassos Dimitriou, Ioannis Krontiris and Fotios Nikakis Athens Information Technology [tdim, ikro, fnik]@ait.gr Abstract We present a protocol for

More information

An Efficient Data Security in Cloud Computing Using the RSA Encryption Process Algorithm

An Efficient Data Security in Cloud Computing Using the RSA Encryption Process Algorithm An Efficient Data Security in Cloud Computing Using the RSA Encryption Process Algorithm V.Masthanamma 1,G.Lakshmi Preya 2 UG Scholar, Department of Information Technology, Saveetha School of Engineering

More information

Network Security. HIT Shimrit Tzur-David

Network Security. HIT Shimrit Tzur-David Network Security HIT Shimrit Tzur-David 1 Goals: 2 Network Security Understand principles of network security: cryptography and its many uses beyond confidentiality authentication message integrity key

More information

Network Security 網 路 安 全. Lecture 1 February 20, 2012 洪 國 寶

Network Security 網 路 安 全. Lecture 1 February 20, 2012 洪 國 寶 Network Security 網 路 安 全 Lecture 1 February 20, 2012 洪 國 寶 1 Outline Course information Motivation Introduction to security Basic network concepts Network security models Outline of the course 2 Course

More information

Chapter 7: Network security

Chapter 7: Network security Chapter 7: Network security Foundations: what is security? cryptography authentication message integrity key distribution and certification Security in practice: application layer: secure e-mail transport

More information

Final Exam. IT 4823 Information Security Administration. Rescheduling Final Exams. Kerberos. Idea. Ticket

Final Exam. IT 4823 Information Security Administration. Rescheduling Final Exams. Kerberos. Idea. Ticket IT 4823 Information Security Administration Public Key Encryption Revisited April 5 Notice: This session is being recorded. Lecture slides prepared by Dr Lawrie Brown for Computer Security: Principles

More information

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

Part I. Universität Klagenfurt - IWAS Multimedia Kommunikation (VK) M. Euchner; Mai 2001. Siemens AG 2001, ICN M NT Part I Contents Part I Introduction to Information Security Definition of Crypto Cryptographic Objectives Security Threats and Attacks The process Security Security Services Cryptography Cryptography (code

More information

Thwarting Selective Insider Jamming Attacks in Wireless Network by Delaying Real Time Packet Classification

Thwarting Selective Insider Jamming Attacks in Wireless Network by Delaying Real Time Packet Classification Thwarting Selective Insider Jamming Attacks in Wireless Network by Delaying Real Time Packet Classification LEKSHMI.M.R Department of Computer Science and Engineering, KCG College of Technology Chennai,

More information

159.334 Computer Networks. Network Security 1. Professor Richard Harris School of Engineering and Advanced Technology

159.334 Computer Networks. Network Security 1. Professor Richard Harris School of Engineering and Advanced Technology Network Security 1 Professor Richard Harris School of Engineering and Advanced Technology Presentation Outline Overview of Identification and Authentication The importance of identification and Authentication

More information

End-to-End Security in Wireless Sensor Networks (WSNs) Talk by Claudio Anliker Supervised by Dr. Corinna Schmitt CSG@IFI, University of Zurich

End-to-End Security in Wireless Sensor Networks (WSNs) Talk by Claudio Anliker Supervised by Dr. Corinna Schmitt CSG@IFI, University of Zurich End-to-End Security in Wireless Sensor (WSNs) Talk by Supervised by Dr. Corinna Schmitt CSG@IFI, University of Zurich Content 1. Motivation 2. Security Issues and Principles 3. Internet-of-Things and Wireless

More information

Ky Vu DeVry University, Atlanta Georgia College of Arts & Science

Ky Vu DeVry University, Atlanta Georgia College of Arts & Science Ky Vu DeVry University, Atlanta Georgia College of Arts & Science Table of Contents - Objective - Cryptography: An Overview - Symmetric Key - Asymmetric Key - Transparent Key: A Paradigm Shift - Security

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

Security in Distributed Systems. Network Security

Security in Distributed Systems. Network Security Security in Distributed Systems Introduction Cryptography Authentication Key exchange Computer Science Lecture 18, page 1 Network Security Intruder may eavesdrop remove, modify, and/or insert messages

More information

NETWORK SECURITY. Farooq Ashraf. Department of Computer Engineering King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia

NETWORK SECURITY. Farooq Ashraf. Department of Computer Engineering King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia NETWORK SECURITY Farooq Ashraf Department of Computer Engineering King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia O u t l i n e o f t h e P r e s e n t a t i o n What is Security

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

Chapter 8 Security. IC322 Fall 2014. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012

Chapter 8 Security. IC322 Fall 2014. Computer Networking: A Top Down Approach. 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Chapter 8 Security IC322 Fall 2014 Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross, All

More information

IP Security. Ola Flygt Växjö University, Sweden http://w3.msi.vxu.se/users/ofl/ Ola.Flygt@vxu.se +46 470 70 86 49

IP Security. Ola Flygt Växjö University, Sweden http://w3.msi.vxu.se/users/ofl/ Ola.Flygt@vxu.se +46 470 70 86 49 IP Security Ola Flygt Växjö University, Sweden http://w3.msi.vxu.se/users/ofl/ Ola.Flygt@vxu.se +46 470 70 86 49 1 Internetworking and Internet Protocols (Appendix 6A) IP Security Overview IP Security

More information

Notes on Network Security Prof. Hemant K. Soni

Notes on Network Security Prof. Hemant K. Soni Chapter 9 Public Key Cryptography and RSA Private-Key Cryptography traditional private/secret/single key cryptography uses one key shared by both sender and receiver if this key is disclosed communications

More information

Mobile Security Wireless Mesh Network Security. Sascha Alexander Jopen

Mobile Security Wireless Mesh Network Security. Sascha Alexander Jopen Mobile Security Wireless Mesh Network Security Sascha Alexander Jopen Overview Introduction Wireless Ad-hoc Networks Wireless Mesh Networks Security in Wireless Networks Attacks on Wireless Mesh Networks

More information

Security in wireless sensor networks

Security in wireless sensor networks WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2008; 8:1 24 Published online 12 September 2006 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/wcm.422 Security

More information

Lecture 6 - Cryptography

Lecture 6 - Cryptography Lecture 6 - Cryptography CSE497b - Spring 2007 Introduction Computer and Network Security Professor Jaeger www.cse.psu.edu/~tjaeger/cse497b-s07 Question 2 Setup: Assume you and I don t know anything about

More information

Public Key Cryptography Overview

Public Key Cryptography Overview Ch.20 Public-Key Cryptography and Message Authentication I will talk about it later in this class Final: Wen (5/13) 1630-1830 HOLM 248» give you a sample exam» Mostly similar to homeworks» no electronic

More information

Security vulnerabilities in the Internet and possible solutions

Security vulnerabilities in the Internet and possible solutions Security vulnerabilities in the Internet and possible solutions 1. Introduction The foundation of today's Internet is the TCP/IP protocol suite. Since the time when these specifications were finished in

More information

Computer Networks. Network Security and Ethics. Week 14. College of Information Science and Engineering Ritsumeikan University

Computer Networks. Network Security and Ethics. Week 14. College of Information Science and Engineering Ritsumeikan University Computer Networks Network Security and Ethics Week 14 College of Information Science and Engineering Ritsumeikan University Security Intro for Admins l Network administrators can break security into two

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

Security & Trust in Wireless Sensor Networks

Security & Trust in Wireless Sensor Networks Security & Trust in Wireless Sensor Networks Theodore Zahariadis Ultra-wide-band Sensor Node Ultra small sensor node The smallest UW sensor node in the world: 10mm 10mm 10mm On board temperature sensor

More information

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ MEng. Nguyễn CaoĐạt 1 Lecture 11: Network Security Reference: Chapter 8 - Computer Networks, Andrew S. Tanenbaum, 4th Edition, Prentice

More information

Secure Routing in Wireless Sensor Networks

Secure Routing in Wireless Sensor Networks Secure Routing in Wireless Sensor Networks Introduction to Wireless Sensor Networks Ida Siahaan / Leonardo Fernandes DIT Ida Siahaan / Leonardo Fernandes (DIT) Secure Routing in Wireless Sensor Networks

More information

Final exam review, Fall 2005 FSU (CIS-5357) Network Security

Final exam review, Fall 2005 FSU (CIS-5357) Network Security Final exam review, Fall 2005 FSU (CIS-5357) Network Security Instructor: Breno de Medeiros 1. What is an insertion attack against a NIDS? Answer: An insertion attack against a network intrusion detection

More information

Security for Ubiquitous and Adhoc Networks

Security for Ubiquitous and Adhoc Networks Security for Ubiquitous and Adhoc Networks Mobile Adhoc Networks Collection of nodes that do not rely on a predefined infrastructure Adhoc networks can be formed merged together partitioned to separate

More information

TELE 301 Network Management. Lecture 18: Network Security

TELE 301 Network Management. Lecture 18: Network Security TELE 301 Network Management Lecture 18: Network Security Haibo Zhang Computer Science, University of Otago TELE301 Lecture 18: Network Security 1 Security of Networks Security is something that is not

More information

Module 7 Security CS655! 7-1!

Module 7 Security CS655! 7-1! Module 7 Security CS655! 7-1! Issues Separation of! Security policies! Precise definition of which entities in the system can take what actions! Security mechanism! Means of enforcing that policy! Distributed

More information

1720 - Forward Secrecy: How to Secure SSL from Attacks by Government Agencies

1720 - Forward Secrecy: How to Secure SSL from Attacks by Government Agencies 1720 - Forward Secrecy: How to Secure SSL from Attacks by Government Agencies Dave Corbett Technical Product Manager Implementing Forward Secrecy 1 Agenda Part 1: Introduction Why is Forward Secrecy important?

More information

Cryptography and Network Security Chapter 14

Cryptography and Network Security Chapter 14 Cryptography and Network Security Chapter 14 Fifth Edition by William Stallings Lecture slides by Lawrie Brown Chapter 14 Key Management and Distribution No Singhalese, whether man or woman, would venture

More information

Computer Networks - CS132/EECS148 - Spring 2013 --------------------------------------------------------------------------

Computer Networks - CS132/EECS148 - Spring 2013 -------------------------------------------------------------------------- Computer Networks - CS132/EECS148 - Spring 2013 Instructor: Karim El Defrawy Assignment 5 Deadline : May 30th 9:30pm (hard and soft copies required) --------------------------------------------------------------------------

More information

Overview. SSL Cryptography Overview CHAPTER 1

Overview. SSL Cryptography Overview CHAPTER 1 CHAPTER 1 Secure Sockets Layer (SSL) is an application-layer protocol that provides encryption technology for the Internet. SSL ensures the secure transmission of data between a client and a server through

More information

Public Key (asymmetric) Cryptography

Public Key (asymmetric) Cryptography Public-Key Cryptography UNIVERSITA DEGLI STUDI DI PARMA Dipartimento di Ingegneria dell Informazione Public Key (asymmetric) Cryptography Luca Veltri (mail.to: luca.veltri@unipr.it) Course of Network Security,

More information

About the Authors Preface Acknowledgements List of Acronyms

About the Authors Preface Acknowledgements List of Acronyms Contents About the Authors Preface Acknowledgements List of Acronyms xiii xv xvii xix Part One Wireless Ad Hoc, Sensor and Mesh Networking 1 1 Introduction 3 1.1 Information Security 4 1.1.1 Computer Security

More information

Overview of CSS SSL. SSL Cryptography Overview CHAPTER

Overview of CSS SSL. SSL Cryptography Overview CHAPTER CHAPTER 1 Secure Sockets Layer (SSL) is an application-level protocol that provides encryption technology for the Internet, ensuring secure transactions such as the transmission of credit card numbers

More information

Secured Communication in Wireless Sensor Networks

Secured Communication in Wireless Sensor Networks Secured Communication in Wireless Sensor Networks Jian Wang \ University of Teas at Arlington, Arlington, TX 77843 Email: {wang_jane@lycos.com} Abstract Recent advancement in wireless communications and

More information

Practice Questions. CS161 Computer Security, Fall 2008

Practice Questions. CS161 Computer Security, Fall 2008 Practice Questions CS161 Computer Security, Fall 2008 Name Email address Score % / 100 % Please do not forget to fill up your name, email in the box in the midterm exam you can skip this here. These practice

More information

Network Security #10. Overview. Encryption Authentication Message integrity Key distribution & Certificates Secure Socket Layer (SSL) IPsec

Network Security #10. Overview. Encryption Authentication Message integrity Key distribution & Certificates Secure Socket Layer (SSL) IPsec Network Security #10 Parts modified from Computer Networking: A Top Down Approach Featuring the Internet, 2nd edition. Jim Kurose, Keith Ross, Addison-Wesley, 2002. 1 Overview Encryption Authentication

More information

Cryptography and Network Security

Cryptography and Network Security Cryptography and Network Security Fifth Edition by William Stallings Chapter 9 Public Key Cryptography and RSA Private-Key Cryptography traditional private/secret/single key cryptography uses one key shared

More information

SECURITY ASPECTS IN MOBILE AD HOC NETWORK (MANETS)

SECURITY ASPECTS IN MOBILE AD HOC NETWORK (MANETS) SECURITY ASPECTS IN MOBILE AD HOC NETWORK (MANETS) Neha Maurya, ASM S IBMR ABSTRACT: Mobile Ad hoc networks (MANETs) are a new paradigm of wireless network, offering unrestricted mobility without any underlying

More information

AC76/AT76 CRYPTOGRAPHY & NETWORK SECURITY DEC 2014

AC76/AT76 CRYPTOGRAPHY & NETWORK SECURITY DEC 2014 Q.2a. Define Virus. What are the four phases of Viruses? In addition, list out the types of Viruses. A virus is a piece of software that can infect other programs by modifying them; the modification includes

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

Chap. 1: Introduction

Chap. 1: Introduction Chap. 1: Introduction Introduction Services, Mechanisms, and Attacks The OSI Security Architecture Cryptography 1 1 Introduction Computer Security the generic name for the collection of tools designed

More information

Table of Contents. Bibliografische Informationen http://d-nb.info/996514864. digitalisiert durch

Table of Contents. Bibliografische Informationen http://d-nb.info/996514864. digitalisiert durch 1 Introduction to Cryptography and Data Security 1 1.1 Overview of Cryptology (and This Book) 2 1.2 Symmetric Cryptography 4 1.2.1 Basics 4 1.2.2 Simple Symmetric Encryption: The Substitution Cipher...

More information

SFWR ENG 4C03 - Computer Networks & Computer Security

SFWR ENG 4C03 - Computer Networks & Computer Security KEY MANAGEMENT SFWR ENG 4C03 - Computer Networks & Computer Security Researcher: Jayesh Patel Student No. 9909040 Revised: April 4, 2005 Introduction Key management deals with the secure generation, distribution,

More information

Preventing Resource Exhaustion Attacks in Ad Hoc Networks

Preventing Resource Exhaustion Attacks in Ad Hoc Networks Preventing Resource Exhaustion Attacks in Ad Hoc Networks Masao Tanabe and Masaki Aida NTT Information Sharing Platform Laboratories, NTT Corporation, 3-9-11, Midori-cho, Musashino-shi, Tokyo 180-8585

More information

Performance Evaluation of AODV, OLSR Routing Protocol in VOIP Over Ad Hoc

Performance Evaluation of AODV, OLSR Routing Protocol in VOIP Over Ad Hoc (International Journal of Computer Science & Management Studies) Vol. 17, Issue 01 Performance Evaluation of AODV, OLSR Routing Protocol in VOIP Over Ad Hoc Dr. Khalid Hamid Bilal Khartoum, Sudan dr.khalidbilal@hotmail.com

More information

Lecture slides by Lawrie Brown for Cryptography and Network Security, 5/e, by William Stallings, Chapter 14 Key Management and Distribution.

Lecture slides by Lawrie Brown for Cryptography and Network Security, 5/e, by William Stallings, Chapter 14 Key Management and Distribution. Lecture slides by Lawrie Brown for Cryptography and Network Security, 5/e, by William Stallings, Chapter 14 Key Management and Distribution. 1 Opening quote. 2 The topics of cryptographic key management

More information

Security in Sensor Networks: Industry Trends, Present and Future Research Directions. Sensor Networks are Here!

Security in Sensor Networks: Industry Trends, Present and Future Research Directions. Sensor Networks are Here! Security in Sensor Networks: Industry Trends, Present and Future Research Directions Adrian Perrig perrig@cmu.edu Sensor Networks are Here! Prototype sensor network deployments Burglar alarm in museum

More information

THE UNIVERSITY OF TRINIDAD & TOBAGO

THE UNIVERSITY OF TRINIDAD & TOBAGO THE UNIVERSITY OF TRINIDAD & TOBAGO FINAL ASSESSMENT/EXAMINATIONS DECEMBER 2013 ALTERNATE Course Code and Title: TCOM3003 Communication Security and Privacy Programme: Bachelor of Applied Science in Computer

More information

Network Security. Network Security. Security in Computer Networks

Network Security. Network Security. Security in Computer Networks Network Security Network Security introduction cryptography authentication key exchange Reading: Tannenbaum, section 7.1 Ross/Kurose, Ch 7 (which is incomplete) Intruder may eavesdrop remove, modify, and/or

More information