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Modern Cryptography

[TOC]

Res

Related Topics

↗ Computationally Hard Problems

Intro

Symmetric-key Asymmetric-key
Confidentiality Block ciphers with chaining modes (e.g., AES-CBC) Public-key encryption(e.g., El Gamal, RSA encryption)
Integrity and authentication MACs (e.g., AES-CBC-MAC) Digital signatures (e.g., RSA signatures)
$Authenticity \subset Integrity$
  • Integrity -> Authenticity
    • If integrity is valid -> no guarantee authenticity is valid
    • If integrity is invalid -> authenticity is invalid
  • Authenticity -> Integrity
    • If authenticity is valid -> integrity is valid
    • If authenticity is invalid -> integrity is invalid

Modern cryptographic techniques:

  1. Symmetric Cipher /Asymmetric Cipher: basic techniques; ensure confidentiality, additionally with other properties depending on how is used.
  2. Message Digest & Hash Functions: ensure integrity (conditionally)
    1. Message authentication: ensure authentication.
  3. Authenticated Encryption (AE): ensure all CIA properties.

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