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Differential analysis of the LED block cipher. (English) Zbl 1292.94112

Wang, Xiaoyun (ed.) et al., Advances in cryptology – ASIACRYPT 2012. 18th international conference on the theory and application of cryptology and information security, Beijing, China, December 2–6, 2012. Proceedings. Berlin: Springer (ISBN 978-3-642-34960-7/pbk). Lecture Notes in Computer Science 7658, 190-207 (2012).
Summary: In this paper, we present a security analysis of the lightweight block cipher LED proposed by Guo et al. at CHES 2011. Since the design of LED is very similar to the Even-Mansour scheme, we first review existing attacks on this scheme and extend them to related-key and related-key-cipher settings before we apply them to LED. We obtain results for 12 and 16 rounds (out of 32) for LED-64 and 16 and 24 rounds (out of 48) for LED-128. Furthermore, we present an observation on full LED in the related-key-cipher setting. For all these attacks we need to find good differentials for one step (4 rounds) of LED. Therefore, we extend the study of plateau characteristics for AES-like structures from two rounds to four rounds when the key addition is replaced with a constant addition. We introduce an algorithm that can be used to find good differentials and right pairs for one step of LED. To be more precise, we can find more than \(2^{10}\) right pairs for one step of LED with complexity of \(2^{16}\) and memory requirement of \(5 \times 2^{17}\). Moreover, a similar algorithm can also be used to find iterative characteristics for the LED.
For the entire collection see [Zbl 1258.94006].

MSC:

94A60 Cryptography

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