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SequenceHash and SequenceMAC prevent ambiguous multihash encodings

blog.trailofbits.com 15 min read Editor score 7/10

The open specification introduces hash constructions intended to avoid attacks on ambiguous input encodings, working with hash functions such as SHA-2, BLAKE, and RIPEMD rather than only Keccak. The approach is relevant to engineers building secure cryptographic protocols and systems.

What

SequenceHash and SequenceMAC are multihash constructions designed to work with secure hash functions beyond Keccak.

How

Unlike raw concatenation, they avoid ambiguous input boundaries and work with common hash functions without non-byte-aligned computations.

Why it matters

Rust, Go, and Python implementations plus test vectors help developers implement and verify secure multihashing.

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