Cryptofriends

My attempts at working through the cryptopals challenges while learning rust 🦀🦀🦀.

Challenges

Set 1 - Basics

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

Set 2 - Block Crypto

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

Set 3 - Block and Stream Crypto

• Challenge 17: The CBC padding oracle
• Challenge 18: Implement CTR, the stream cipher mode
• Challenge 19: Break fixed-nonce CTR mode using substitutions
• Challenge 20: Break fixed-nonce CTR statistically
• Challenge 21: Implement the MT19937 Mersenne Twister RNG
• Challenge 22: Crack an MT19937 seed
• Challenge 23: Clone an MT19937 RNG from its output
• Challenge 24: Create the MT19937 stream cipher and break it

Set 4 - Stream crypto and randomness

• Challenge 25: Break "random access read/write" AES CTR
• Challenge 26: CTR bitflipping
• Challenge 27: Recover the key from CBC with IV=Key
• Challenge 28: Implement a SHA-1 keyed MAC
• Challenge 29: Break a SHA-1 keyed MAC using length extension
• Challenge 30: Break an MD4 keyed MAC using length extension
• Challenge 31: Implement and break HMAC-SHA1 with an artificial timing leak
• Challenge 32: Break HMAC-SHA1 with a slightly less artificial timing leak

Set 5 - Diffie-Hellman and friends

• Challenge 33: Implement Diffie-Hellman
• Challenge 34: Implement a MITM key-fixing attack on Diffie-Hellman with parameter injection
• Challenge 35: Implement DH with negotiated groups, and break with malicious "g" parameters
• Challenge 36: Implement Secure Remote Password (SRP)
• Challenge 37: Break SRP with a zero key
• Challenge 38: Offline dictionary attack on simplified SRP
• Challenge 39: Implement RSA
• Challenge 40: Implement an E=3 RSA Broadcast attack

Set 6 - RSA and DSA

• Challenge 41: Implement unpadded message recovery oracle
• Challenge 42: Bleichenbacher's e=3 RSA Attack
• Challenge 43: DSA key recovery from nonce
• Challenge 44: DSA nonce recovery from repeated nonce
• Challenge 45: DSA parameter tampering
• Challenge 46: RSA parity oracle
• Challenge 47: Bleichenbacher's PKCS 1.5 Padding Oracle (Simple Case)
• Challenge 48: Bleichenbacher's PKCS 1.5 Padding Oracle (Complete Case)