Beyond Modes: Building a Secure Record Protocol from a Cryptographic Sponge Permutation

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Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
Blinker is a light-weight cryptographic suite and record protocol built from a single permutation. Its design is based on the sponge construction used by the SHA-3 algorithm keccak. The authors examine the SpongeWrap authenticated encryption mode and expand its padding mechanism to offer explicit domain separation and enhanced security for their specific requirements: shared secret half-duplex keying, encryption, and aMAC-and-continue mode. They motivate these enhancements by showing that unlike legacy protocols, the resulting record protocol is secure against a two-channel synchronization attack while also having a significantly smaller implementation footprint.
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