International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Kashif Ali

Publications

Year
Venue
Title
2008
EPRINT
Results from a Search for the Best Linear Approximation of a Block Cipher
Kashif Ali Howard M. Heys
In this paper, we investigate the application of an algorithm to find the best linear approximation of a basic Substitution-Permutation Network block cipher. The results imply that, while it is well known that the S-box used for the Advanced Encryption Standard has good nonlinear properties, it is straightforward to randomly select other S-boxes which are able to provide a similar level of security, as indicated by the exact bias of the best linear approximation found by the algorithm, rather than a simple upper bound on the maximum bias.

Coauthors

Howard M. Heys (1)