Writeup for Interpol from CryptoCTF 2025: recovering the flag from a Lagrange interpolation oracle that leaks characters through rational data points.
Writeup for Mancity from CryptoCTF 2025: factoring a 256-bit RSA modulus whose primes come from a custom bit-pattern generator.
Writeup for Matemith from CryptoCTF 2025: recovering the flag chunks by solving a multivariate polynomial system with Groebner bases.
Writeup for Mechanic from CryptoCTF 2025: reconstructing a hidden integer from ML-KEM encrypted flag fragments to decrypt the image flag.
Writeup for Vainrat from CryptoCTF 2025: recovering an integer hidden inside a high-precision real number from an interactive oracle.
Writeup for Vinad from CryptoCTF 2025: factoring an RSA modulus whose prime is generated from a binary parity (Hamming weight) function.
