My cryptopals solutions
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Antoxyde b1283c8829 modif readme 1 month ago
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README.md

Cryptopals challenges

Tests

I decided to organize the challenges by tests, so you can easily filter them using cargo. For example, you can type cargo test set01 to run all set01 challenges’s tests, or cargo test ch1 to run only challenge 1’s test.

Actual crypto code

While doing these challenges, i decided to make my own ctf crypto library, so most of the crypto code is not in this repo. You can find it here : https://git.antoxyde.fr/Antoxyde/cryptoctf This repo only contains the use of this library to solve cryptopals challenges.

Stage 1: Basics

  • 01. Convert hex to base64
  • 02. Fixed XOR
  • 03. Single-byte XOR cipher
  • 04. Detect single-character XOR
  • 05. Implement repeating-key XOR
  • 06. Break repeating-key XOR
  • 07. AES in ECB mode
  • 08. Detect AES in ECB mode

Stage 2: Block Crypto

  • 09. 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

Stage 3: Block & Stream Crypto

  • [~] 17. The CBC padding oracle
  • [~] 18. Implement CTR, the stream cipher mode
  • 19. Break fixed-nonce CTR mode using substitions
  • 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

Stage 4: Stream Crypto and Randomness

  • 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

Stage 5: Diffie-Hellman and Friends

  • 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

Stage 6: RSA and DSA

  • 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)

Stage 7: Hashes

  • 49. CBC-MAC Message Forgery
  • 50. Hashing with CBC-MAC
  • 51. Compression Ratio Side-Channel Attacks
  • 52. Iterated Hash Function Multicollisions
  • 53. Kelsey and Schneier’s Expandable Messages
  • 54. Kelsey and Kohno’s Nostradamus Attack
  • 55. MD4 Collisions
  • 56. RC4 Single-Byte Biases