Welcome to the resource topic for 2024/1474
Title:
Mystrium: Wide Block Encryption Efficient on Entry-Level Processors
Authors: Parisa Amiri Eliasi, Koustabh Ghosh, Joan Daemen
Abstract:We present a tweakable wide block cipher called Mystrium and show it as the fastest such primitive on low-end processors that lack dedicated AES or other cryptographic instructions, such as ARM Cortex-A7.
Mystrium is based on the provably secure double-decker mode, that requires a doubly extendable cryptographic keyed (deck) function and a universal hash function.
We build a new deck function called Xymmer that for its compression part uses Multimixer-128, the fastest universal hash for such processors, and for its expansion part uses a newly designed permutation, \mathcal{G}_{512}.
Deck functions can also be used in modes to build encryption, authenticated encryption, and authentication schemes, and hence, Xymmer is of independent interest.
The current state-of-the-art wide tweakable block cipher Adiantum-XChaCha12-AES encrypts 4096-byte messages at 11.5 cycles per byte on ARM Cortex-A7, while for Mystrium it is 6.8 cycles per byte while having a higher claimed security.
ePrint: https://eprint.iacr.org/2024/1474
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