Crypto Challenges Write-ups

xorxorxor

Exploiting xor with small key length

The_Last_Dance

Nonce Reuse

RSAisEasy

Rhome

generator g operates within a very small subgroup of the prime field

Quantum_Safe

Breaking Cipher using linear algebra

Protein_Cookies

Exploiting a Hash Length Extension vulnerability

Embryonic_Plant

challenge involves exploiting a custom Linear Congruential Generator where the RNG's parameters are derived from the prime factors of a multi-prime RSA modulus.

BabyEncryption

Breaking Affine Cipher

Baby_Time_Capsule

Håstad's Broadcast Attack