Improved Multiple Impossible Differential Cryptanalysis of Midori128

Mohamed TOLBA  Ahmed ABDELKHALEK  Amr M. YOUSSEF  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A   No.8   pp.1733-1737
Publication Date: 2017/08/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Cryptography and Information Security
Keyword: 
cryptanalysis,  impossible differential cryptanalysis,  block ciphers,  Midori128,  

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Summary: 
Midori128 is a lightweight block cipher proposed at ASIACRYPT 2015 to achieve low energy consumption per bit. Currently, the best published impossible differential attack on Midori128 covers 10 rounds without the pre-whitening key. By exploiting the special structure of the S-boxes and the binary linear transformation layer in Midori128, we present impossible differential distinguishers that cover 7 full rounds including the mix column operations. Then, we exploit four of these distinguishers to launch multiple impossible differential attack against 11 rounds of the cipher with the pre-whitening and post-whitening keys.