Nonlinearity of the Round Function

Marcin Kontak; Janusz Szmidt

Paper 2005/299

Nonlinearity of the Round Function

Marcin Kontak and Janusz Szmidt

Abstract

In the paper we present the results which enable to calculate the nonlinearity of round functions with quite large dimensions e.g. 32x32 bits, which are used in some block ciphers. This can be applied to improve the resistance of these ciphers against linear cryptanalysis. The involved method of calculating the nonlinearity is rested on the notion of multi-dimensional Walsh transform. At the end we give the application to linear cryptanalysis of the TGR block cipher.

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Keywords: Boolean functions Walsh transform nonlinearity S-boxes round function TGR cipher
Contact author(s): mkontak @ wp pl
History: 2005-09-01: received
Short URL: https://ia.cr/2005/299
License: CC BY

BibTeX

@misc{cryptoeprint:2005/299,
      author = {Marcin Kontak and Janusz Szmidt},
      title = {Nonlinearity of the Round Function},
      howpublished = {Cryptology {ePrint} Archive, Paper 2005/299},
      year = {2005},
      url = {https://eprint.iacr.org/2005/299}
}