Abstract
mCrypton is a 64-bit lightweight block cipher designed for use in low-cost and resource-constrained applications such as RFID tags and sensors in wireless sensor networks. In this paper, we investigate the strength of this cipher against related-key impossible differential cryptanalysis. First, we construct two 6-round related-key impossible differentials for mCrypton-96 and mCrypton-128. Then, using these distinguishers, we present 9-round related-key impossible differential attacks on these two versions. The attack on mCrypton-96 requires 259.9 chosen plaintexts, and has a time complexity of about 274.9 encryptions. The data and time complexities for the attack on mCrypton-128 are 259.7 chosen plaintexts and 266.7 encryptions, respectively. Copyright © 2011 John Wiley & Sons, Ltd.
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