Zero-knowledge

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  • King Halo: When a Zero-Knowledge Circuit Forgets to Constrain the Path Length

    A write-up of the crypto challenge King Halo from WannaGame Championship 2025, where a Halo2 Merkle circuit verifies a path without constraining its length, so an empty path reduces the whole proof to leaf equals root and membership is never proved at all.

    6 min read 1,062 words Category: Security Tags: ctf, cryptography, zero knowledge