Introduction to Security. CSS 322 Security and Cryptography
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1 Introduction to Security CSS 322 Security and Cryptography
2 Contents Terminology and Trends Security Services, Mechanisms and Attacks Who s Who in Network Security CSS Introduction to Security 2
3 Computer Security Terminology and Scope Collection of tools designed to protect data and thwart hackers in computer systems Network Security Measures to protect data during their transmission Internet Security Measures to protect data during their transmission over collection of interconnected networks (e.g. an internet) There is a lot of overlap between the above! This course will focus on Internet Security CSS Introduction to Security 3
4 Security Trends Reported vulnerabilities in applications, operating systems and network software have grown significantly in past 10 years Security incidents reported have also grown at exponential rate See CERT website for latest statistics ( Attacks are becoming more sophisticated, but easier to perform The Internet (and computers on Internet) has enabled these changes, and become target of attack CSS Introduction to Security 4
5 Aspects of Security Need a systematic approach to describing requirements and characteristics of computer/network security ITU-T X.800 Security Architecture for OSI provides conceptual description of a security architecture X.800 focuses on 3 aspects of security 1. Security Attack Any action that attempts to compromise the security of information or facilities 2. Security Mechanism A method of preventing, detecting or recovering from an attack 3. Security Service Uses security mechanisms to enhance the security of information or facilities in order to stop attacks CSS Introduction to Security 5
6 Security Attacks Passive Attacks Make use of information, but not affect system resources Eavesdropping or monitoring transmissions of information Release message contents Traffic analysis Relatively hard to detect, but easier to prevent Active Attacks Alter system resources or operation. Four sub-types: Masquerade: pretend to be someone else Replay: retransmission of captured information Modification: change message contents Denial of service: reduce the availability of resources Relatively hard to prevent, but easier to detect (Ability to detect may act as a deterrent or prevent attacks) CSS Introduction to Security 6
7 Passive: Release Message Contents CSS Introduction to Security 7
8 Passive: Traffic Analysis CSS Introduction to Security 8
9 Active Attack: Masquerade CSS Introduction to Security 9
10 On the Internet, nobody knows if you re a dog CSS Introduction to Security 10
11 Active Attack: Replay CSS Introduction to Security 11
12 Active Attack: Modification CSS Introduction to Security 12
13 Active Attack: Denial of Service for example CSS Introduction to Security 13
14 Security Services RFC2828: A processing or communication service that is provided by a system to give a specific kind of protection to system resources Can be classified as: Authentication: assure that the communication and the communicating entities are authentic, e.g. a warning signal is real; a person is who they claim to be Access Control: limit and control access to computers, network resources and applications Data Confidentiality: protect data from passive attacks; privacy of communications Data Integrity: assure data sent is not duplicated, modified, inserted, replayed, deleted, Nonrepudiation: prevent sender or receiver from denying a message has been sent Availability Service: protect system so it is available for intended purpose CSS Introduction to Security 14
15 Security Mechanisms Techniques available for implementing services to prevent or detect attacks Selected X.800 mechanisms (and examples): Encipherment/encryption (symmetric and public key) Access Control (firewall) Data Integrity (message digests, digital signatures) Authentication Exchange (certification authorities) Notarisation (signatures, timestamps, witnesses) We cover these mechanisms in later topics CSS Introduction to Security 15
16 Model for Network Security Simple model of most security systems we will cover CSS Introduction to Security 16
17 Who s Who in Security Standards ITU, ISO and IEC: International standards including OSI IETF: Internet standards NIST: US standards TISI: Thai Industrial Standards Institute Certification (ISC)2: Certified Information System Security Professional (CISSP) SANS: GIAC Security Engineer CompTIA: Security+ Warning and Response CERT (Computer Emergency Response Team) US-CERT, ThaiCERT, Certificates Verisign, Entrust, CAcert, Products and Solutions RSA, Cisco, Juniper, Symantec, McAfee, CSS Introduction to Security 17
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