My solutions, in Python, to the cryptopals crypto challenges - https://cryptopals.com/
Set 1
- 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
- 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
Set 3
- 17. The CBC padding oracle
- 18. Implement CTR, the stream cipher mode
- 19. Break fixed-nonce CTR mode using substitutions
- 20. Break fixed-nonce CTR statistically
- 21. Implement the MT19937 Mersenne Twister RNG
- 22. Crack an MT19937 seed
- 23. Clone an MT19937 RNG from its output
- 24. Create the MT19937 stream cipher and break it
Set 4
- 25. Break "random access read/write" AES CTR
- 26. CTR bitflipping
- 27. Recover the key from CBC with IV=Key
- 28. Implement a SHA-1 keyed MAC
- 29. Break a SHA-1 keyed MAC using length extension
- 30. Break an MD4 keyed MAC using length extension
- 31. Implement and break HMAC-SHA1 with an artificial timing leak
- 32. Break HMAC-SHA1 with a slightly less artificial timing leak
Set 5
- 33. Implement Diffie-Hellman
- 34. Implement a MITM key-fixing attack on Diffie-Hellman with parameter injection
- 35. Implement DH with negotiated groups, and break with malicious "g" parameters
- 36. Implement Secure Remote Password (SRP)
- 37. Break SRP with a zero key
- 38. Offline dictionary attack on simplified SRP
- 39. Implement RSA
- 40. Implement an E=3 RSA Broadcast attack
Set 6
- 41. Implement unpadded message recovery oracle
- 42. Bleichenbacher's e=3 RSA Attack
- 43. DSA key recovery from nonce
- 44. DSA nonce recovery from repeated nonce
- 45. DSA parameter tampering
- 46. RSA parity oracle
- 47. Bleichenbacher's PKCS 1.5 Padding Oracle (Simple Case)
- 48. Bleichenbacher's PKCS 1.5 Padding Oracle (Complete Case)