minervas-stopwatch - TJCTF 2026 Ankith Abhayan 2026-06-11 Crypto tl;dr ECDSA signature samples with biased nonce of varying bit lengths given. Private key modeled as an instance of the Hidden Number Problem (HNP). Recovery with LLL. Read More Elliptic Curve TJCTF HNP Lattice ECDSA
...Like PRNGS to Heaven - bi0sCTF 2025 AeroSol 2025-06-13 Crypto tl;dr ECDSA signing server with biased nonce Exploitation by modelling a EHNP instance and using z3 Solver for breaking Mersenne Twister Read More bi0sCTF PRNG Prediction ecdsa Lattice EHNP z3