At CHES 2006, a DPA countermeasure based on the Fourier Transform was published. This generic countermeasure aims at protecting from DPA any S-box calculation used in symmetric cryptosystems implementations. In this paper, we show that this countermeasure has a flaw and that it can be broken by first order DPA. Moreover, we have successfully put into practice our attack on two different S-box i...

In this paper, we present new key-recovery attacks on AES with a single secret S-Box. Several attacks for this model have been proposed in literature, the most recent ones at Crypto’16 and FSE’17. Both these attacks exploit a particular property of the MixColumns matrix to recover the secret-key. In this work, we show that the same attacks work exploiting a weaker property of the MixColumns mat...

The objective of this contribution is to introduce an analogue to the classical secret-key block ciphers, such as DES, IDEA or AES, in the nondenumerable setting, namely where cleartexts, plaintexts and keys are real numbers. The nonlinear part of traditional secret-key block ciphers, the S-boxes, is designed to provide confusion i.e. to resist to several kind of cryptanalysis such as algebraic...

This paper discusses white box cryptography, which is used to protect the key from white box attack. Previously white box cryptography was applied to symmetric key encryption, which does provide protection mechanism to the key, but affects the performance and is considered difficult to update the key. The scheme proposed by the researcher mentions White Box AES and improves its low performance ...

In this paper, we examine the avalanche characteristics of private-key block ciphers constructed using a DES-like architecture. Avalanche is a desirable cryptographic property that is necessary to ensure that a small diierence between two plaintexts results in a seemingly random diierence between the two corresponding ciphertexts. In order to examine the behaviour of DES-like ciphers in relatio...