Randomness Analysis of Key-Derived S-Boxes

Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 239)

Abstract

Although many ciphers use fixed, close to ideal, s-boxes (like AES for example), random s-boxes offer an interesting alternative since they have no underlying structure that can be exploited in cryptanalysis. For this reason, some cryptosystems generate pseudo-random s-boxes as a function of the key (key-derived).

We analyse the randomness properties of key-derived s-boxes generated by some popular cryptosystems like the RC4 stream cipher, and the Blowfish and Twofish block ciphers with the aim of establishing if this kind of s-boxes are indistinguishable from purely random s-boxes.

For this purpose we have developed a custom software framework to generate and evaluate random and key derived s-boxes.

Keywords

S-Boxes Key-Derived Random RC4 Blowfish Twofish 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Dpt. of Computer Science and Artificial Intelligence (DCCIA)University of Alicante (Campus de San Vicente)AlicanteSpain

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