Matasano Crypto Challenges

Solutions to the crypto challenge: http://cryptopals.com/

The solutions require pycrypto. I had to install this manually using python setup.py install inside a virtualenv.

Set 1: Basics

• 1. Convert hex to base64
• 2. Fixed XOR
• 3. Single-byte XOR cipher
• 4. Detect single-character XOR
• 5. Implement repeating-key XOR
• 6. Break repeating-key XOR
• 7. AES in ECB mode
• 8. Detect AES in ECB mode

Set 2: Block crypto

• 9. Implement PKCS#7 padding
• 10. Implement CBC mode
• 11. An ECB/CBC detection oracle
• 12. Byte-at-a-time ECB decryption (Simple)
• 13. ECB cut-and-paste
• 14. Byte-at-a-time ECB decryption (Harder)
• 15. PKCS#7 padding validation
• 16. CBC bitflipping attacks