Crypto

Cryptanalysis of historical ciphers

• Shift cipher: shift.py

Indistinguishability experiments

• Private-key encryption schemes: cipher.py
• PrivK experiment driver: privk-eav.py
  • Adv randomly guessing: mallory0.py
  • Adv for Shift cipher in ECB mode: mallory1.py
  • Adv for Shift cipher with unbalanced keys: mallory2.py
  • Adv for Vigenère cipher with unbalanced keys: mallory3.py
  • Adv for OTP with computed last bit: mallory4.py
  • Adv for two-time pad: mallory5.py
  • Adv for quasi-OTP: mallory6.py

Hash functions

• Big-space birthday attack
• Small-space birthday attack