Lecture 8 - Network security issues #

Scope of the lecture #

• Elementary cryptographic techniques
  • Encryption/decryption:
    • Symmetric cryptography
    • Asymmetric cryptography
  • Computation of message digest
  • Generation of cryptographically secure random numbers
• Cryptographic services:
  • confidentiality
  • data integrity
  • sender authentication
  • Sender non-repudiation
• Kerckhoffs’ principle
• Validation of public keys:
  • Distributed web of trust
  • Public Key Infrastructure (PKI)
• Cryptography in network protocols:IPSec, SSL/TLS. SSL and secure tunneling.

Reference #

1. Slides: Inet_4en.pdf
2. Textbook: chapter 15.4 – “Cryptography as a security tool”