mrbrianhobo/cryptopals

🐹 cryptopals in go

cryptopals 🐹

crypto challenges from cryptopals.com

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

cryptopals's Issues

Set 5: Diffie-Hellman & Friends

https://cryptopals.com/sets/5

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

Set 1: Basics

https://cryptopals.com/sets/1

• Convert hex to base64
• Fixed XOR
• Single-byte XOR cipher
• Detect single-character XOR
• Implement repeating-key XOR
• Break repeating-key XOR
• AES in ECB mode
• Detect AES in ECB mode

Set 2: Block Crypto

https://cryptopals.com/sets/2

• Implement PKCS#7 padding
• Implement CBC mode
• An ECB/CBC detection oracle
• Byte-at-a-time ECB decryption (Simple)
• ECB cut-and-paste
• Byte-at-a-time ECB decryption (Harder)
• PKCS#7 padding validation
• CBC bitflipping attacks

Set 6: RSA & DSA

https://cryptopals.com/sets/6

• Implement unpadded message recovery oracle
• Bleichenbacher's e=3 RSA Attack
• DSA key recovery from nonce
• DSA nonce recovery from repeated nonce
• DSA parameter tampering
• RSA parity oracle
• Bleichenbacher's PKCS 1.5 Padding Oracle (Simple Case)
• Bleichenbacher's PKCS 1.5 Padding Oracle (Complete Case)

Set 4: Stream Crypto & Randomness

https://cryptopals.com/sets/4

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

Set 7: Hashes

https://cryptopals.com/sets/7

• CBC-MAC Message Forgery
• Hashing with CBC-MAC
• Compression Ratio Side-Channel Attacks
• Iterated Hash Function Multicollisions
• Kelsey and Schneier's Expandable Messages
• Kelsey and Kohno's Nostradamus Attack
• MD4 Collisions
• RC4 Single-Byte Biases

Set 3: Block & Stream Crypto

https://cryptopals.com/sets/3

• The CBC padding oracle
• Implement CTR, the stream cipher mode
• Break fixed-nonce CTR mode using substitutions
• Break fixed-nonce CTR statistically
• Implement the MT19937 Mersenne Twister RNG
• Crack an MT19937 seed
• Clone an MT19937 RNG from its output
• Create the MT19937 stream cipher and break it