V1t CTF 2026 Writeup: 8 Challenges Solved (Crypto, Reverse, Web, Misc)
V1t CTF 2026 shipped a small but unusually well-curated set of challenges. Every one of the eight problems covered here teaches a specific primitive: a structured-prime RSA factored by stage-1 ECM on a j = 0 curve, a ZUC stream cipher recovered from three leak functions without the key, a 904-byte ELF whose only validation is the byte-sum of the input, a TCC binary dressed up in packer-section costume but driven by a tiny 365-byte stack VM, a KMDF driver that binds to its userland by FNV-1a of .text, a font file aliased back to Noto Sans that quietly rewrites emoji into letters, and a 16-character allowlist regex on a shell=True command that still leaks the flag via python3 dis.py and globs. ...