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- W2406798186 abstract "We propose the Synthetic Counter-in-Tweak ( $$mathsf {SCT}$$ ) mode, which turns a tweakable block cipher into a nonce-based authenticated encryption scheme (with associated data). The $$mathsf {SCT}$$ mode combines in a SIV-like manner a Wegman-Carter MAC inspired from $$mathsf {PMAC}$$ for the authentication part and a new counter-like mode for the encryption part, with the unusual property that the counter is applied on the tweak input of the underlying tweakable block cipher rather than on the plaintext input. Unlike many previous authenticated encryption modes, $$mathsf {SCT}$$ enjoys provable security beyond the birthday bound (and even up to roughly $$2^n$$ tweakable block cipher calls, where n is the block length, when the tweak length is sufficiently large) in the nonce-respecting scenario where nonces are never repeated. In addition, $$mathsf {SCT}$$ ensures security up to the birthday bound even when nonces are reused, in the strong nonce-misuse resistance sense (MRAE) of Rogaway and Shrimpton (EUROCRYPT 2006). To the best of our knowledge, this is the first authenticated encryption mode that provides at the same time close-to-optimal security in the nonce-respecting scenario and birthday-bound security for the nonce-misuse scenario. While two passes are necessary to achieve MRAE-security, our mode enjoys a number of desirable features: it is simple, parallelizable, it requires the encryption direction only, it is particularly efficient for small messages compared to other nonce-misuse resistant schemes (no precomputation is required) and it allows incremental update of associated data." @default.
- W2406798186 created "2016-06-24" @default.
- W2406798186 creator A5012053340 @default.
- W2406798186 creator A5048055873 @default.
- W2406798186 date "2016-01-01" @default.
- W2406798186 modified "2023-10-09" @default.
- W2406798186 title "Counter-in-Tweak: Authenticated Encryption Modes for Tweakable Block Ciphers" @default.
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- W2406798186 doi "https://doi.org/10.1007/978-3-662-53018-4_2" @default.
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