README.md

Crypto-Challenges

My attempt at completing the cryptopals crypto challenges and planning to learn Clojure on the side.

Run lein parallel-test to run all challenges.

Completed challenges

• Set 1
  • Convert hex to base64
  • Fixed XOR
  • Single XOR-byte cipher
  • Detect single-character XOR
  • Repeating XOR-cipher
  • Decrypting repeating key XOR
  • AES in ECB mode
  • Detect AES in ECB mode
• Set 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 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
• Set 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 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 6
• Set 7
• Set 8