Network Security and Cryptography

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Presentation transcript:

Network Security and Cryptography Tri Van Le Office: 206 Love Building Phone: (850) 644-4004 Email: levan@cs.fsu.edu

Outline Introduction Security attacks Methods of defense Practical Applications A model for IP Security Internet standards and RFCs

Attacks, Services and Mechanisms Security Attack: Any action that compromises the security of information. Security Mechanism: A mechanism that is designed to detect, prevent, or recover from a security attack. Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms.

Security Attacks

Security Attacks Interruption: This is an attack on availability Interception: This is an attack on confidentiality Modification/Fabrication: This is an attack on integrity/authenticity

Security Goals Confidentiality Integrity Availability

Security Services Confidentiality (privacy) Authentication (who created or sent the data) Integrity (has not been altered) Non-repudiation (undeniable) Access control (prevent misuse of resources) Availability (permanence, non-erasure) Denial of Service Attacks Virus that deletes files

Methods of Defense Encryption Software Controls (access limitations in a data base, in operating system protect each user from other users) Hardware Controls (smartcard) Policies (frequent changes of passwords) Physical Controls

Internet standards and RFCs The Internet society Internet Architecture Board (IAB) Internet Engineering Task Force (IETF) Internet Engineering Steering Group (IESG)

Internet RFC Publication Process

References Computer Security. Dieter Gollmann, John Wiley and Sons Ltd, 1999. Handbook of Applied Cryptography. CRC Press, 2001. Freely available at: http://www.cacr.math.uwaterloo.ca/hac/