Reference : Differential entropy analysis of the IDEA block cipher
Scientific journals : Article
Engineering, computing & technology : Computer science
Differential entropy analysis of the IDEA block cipher
Biryukov, Alex mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Computer Science and Communications Research Unit (CSC) > ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)]
Nakahara, Jorge [> >]
Murat Yildirim, Hamdi [> >]
Journal of Computational and Applied Mathematics
Elsevier Science
Part B
Yes (verified by ORBilu)
The Netherlands
[en] entropy ; differential ; cryptanalysis
[en] This paper describes a new cryptanalytic technique that combines differential cryptanalysis with Shannon entropy. We call it differential entropy (DE). The objective is to exploit the non-uniform distribution of output differences from a given mapping as a distinguishing tool in cryptanalysis. Our preferred target is the IDEA block cipher, since we detected significantly low entropy at the output of its multiplication operation. We looked to further extend this entropy analysis to larger components and for a number of rounds. We present key-recovery attacks on up to 2.5-round IDEA in the single-key model and without weak-key assumptions.
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