2019 | OriginalPaper | Buchkapitel
Mind the Gap - A Closer Look at the Security of Block Ciphers against Differential Cryptanalysis
verfasst von : Ralph Ankele, Stefan Kölbl
Erschienen in: Selected Areas in Cryptography – SAC 2018
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Abstract
Midori
, Skinny
or Sparx
one has to be careful as bounds from counting the number of active S-boxes only give an inaccurate evaluation of the best differential distinguishers. For several designs we found new differential distinguishers and show how this gap evolves. We found an 8-round differential distinguisher for Skinny
-64 with a probability of \(2^{-56.93}\), while the best single characteristic only suggests a probability of \(2^{-72}\). Our approach is integrated into publicly available tools and can easily be used when developing new cryptographic primitives.Skinny
-64 the distribution over the keys follows a Poisson distribution, as one would expect, we noticed that Speck
-64 follows a bimodal distribution, and the distribution of Midori
-64 suggests a large class of weak keys.