Handshake Forge

Break transcript binding in a custom noise-like handshake.

Challenge brief

A proprietary handshake claims forward secrecy with an extra binding tag. The tag omits one ephemeral. Forge a completed handshake transcript accepted by the reference verifier.

Flag format: GB{...}

Puzzle artifacts

handshake_spec.md

Protocol notes

# Handshake Forge
Binding omits eph_b.

Demo artifacts — synthetic files for the interactive MVP flow

Submit proof

Demo verification is client-side for this MVP. Live contests will score server-side. Lattice Fold demo flag: GB{lattice_short_basis_recovered}