ECE509 Cyber Security : Concept, Theory, and Practice Cryptography Spring 2014.

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Presentation transcript:

ECE509 Cyber Security : Concept, Theory, and Practice Cryptography Spring 2014

Attack Types Passive attack: observe communications and/or data Active attack: modify communications and/or data

What are the security services in the OSI model?

Security Services in OSI Model Physical Layer: Data-Link Layer: Network Layer: Transport Layer: Session Layer: Presentation Layer: Application Layer:

Security Services in OSI Model Confidentiality Integrity Authentication Access Control Non-repudiation

Security Mechanisms to provide the needed security services Checksums/hash algorithms: Authorization and Integrity Encryption: Confidentiality, Integrity, Authentication Digital signatures: Integrity, Authentication, Non- repudiation

Secure Sockets Layer (SSL) Mechanisms: –Hashing SHA: Secure Hash Algorithm MD5: Message-Digest algorithm –Encryptions DES: Data Encryption Standard RSA: Ron Rivest, Adi Shamir, and Leonard Adleman –Signatures DSA: Digital Signature Algorithm RSA: Ron Rivest, Adi Shamir, and Leonard Adleman

Hash Function Data Channel Hashing Message Hash Message Hash Data

MAC (Message Authentication Code) Data Channel MAC Data Channel Message MAC Message MAC

Traditional Encryption (Symmetric Encryption) Common Key Insecure Channel Data

Key Agreement Insecure Channel Data

Public Key Encryption Insecure Channel Data

Digital Signature Data Channel Hashing Message Hash Message Hash Data Encrypt Signature Channel Signature

Digital Signature Data Signature Hashing Decrypt Compare Message Hash

Message/Data Encryption Data Encrypted Session Key Encrypted Session Key Encrypted Session Key Encrypted Session Key Channel

Reading “Understanding Security Using the OSI Model”, SANS Institute InfoSec Reading Room, [ room/whitepapers/protocols/understanding -security-osi-model-377 ] room/whitepapers/protocols/understanding -security-osi-model-377