International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 31 July 2015

William Diehl
ePrint Report ePrint Report
The encryption mode of the Tweakable Block Cipher (TBC) of the SCREAM Authenticated Cipher is implemented in the MSP430 microcontroller. Assembly language versions of the TBC are prepared using both precomputed tweak keys and tweak keys computed \"on-the-fly.\" Both versions are compared against published results for the assembly language version of SCREAM on the ATMEL AVR microcontroller, and against the C reference implementation in terms of performance and size. The assembly language version using precomputed tweak keys achieves a speedup of 1.7 and memory savings of 9 percent over the reported SCREAM implementation in the ATMEL AVR. The assembly language version using tweak keys computed \"on-the-fly\" achieves a speedup of 1.6 over the ATMEL AVR version while reducing memory usage by 15 percent.

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