Cross-Correlation Analysis of Cryptographically Useful Boolean Functions and S-Boxes |
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Authors: | P Sarkar S Maitra |
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Affiliation: | (1) Applied Statistics Unit, Indian Statistical Institute, 203 B.T. Road, Calcutta 700 035, India palash@isical.ac.in, IN;(2) Computer and Statistical Service Centre, Indian Statistical Institute, 203 B.T. Road, Calcutta 700 035, India subho@isical.ac.in, IN |
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Abstract: | We use the cross-correlation function as a fundamental tool to study cryptographic properties of Boolean functions. This
provides a unified treatment of a large section of Boolean function literature. In the process we generalize old results and
obtain new characterizations of cryptographic properties. In particular, new characterizations of bent functions and functions
satisfying propagation characteristics are obtained in terms of the cross-correlation and auto-correlation properties of subfunctions.
The exact relationship between the algebraic structure of the non-zeros of the spectrum and the auto-correlation values is
obtained for a cryptographically important class of functions. Finally we study the suitability of S-boxes in stream ciphers
and conclude that currently known constructions for S-boxes may not be adequate for such applications.
Received April 27, 2001, and in revised form October 30, 2001. Online publication February 20, 2002. |
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