International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 08 September 2013

Farzaneh Abed, Eik List, Stefan Lucks, Jakob Wenzel
ePrint Report ePrint Report
Simon and Speck are two families of ultra-lightweight block ciphers which were proposed by the U.S. National Security Agency in June 2013. Yet, the specification paper discusses only the design and the performance of both cipher families, the task of analyzing their security has been left to the research community.

In this paper we present conventional differential as well as rectangle attacks for almost all members of the \\speck cipher family, where we target up to 11/22, 12/23, 14/16, 15/29, and 18/34 rounds of the 32-, 48-, 64-, 96-, and 128-bit version, respectively. In addition, we discuss rotational attacks, where we show that these attacks can be easily mounted for the full or almost the full number of rounds for large groups of weak keys.

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