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Enhancing the security of block ciphers with the aid of parallel substitution box construction | IEEE Conference Publication | IEEE Xplore

Enhancing the security of block ciphers with the aid of parallel substitution box construction


Abstract:

When considering block cipher designs, one feature that is seemingly not related to their robustness of a design is algorithmic variability, i.e. the ability to effect ch...Show More

Abstract:

When considering block cipher designs, one feature that is seemingly not related to their robustness of a design is algorithmic variability, i.e. the ability to effect changes on a design that essentially leave its structure unchanged while they modify its functional characteristics. This feature, however, is related to robustness as there are situations where a specific algorithm is either suspected to be under cryptanalytic attack or it is not considered secure any more due to a discovered weakness. The easiest action would be to change the characteristics of the algorithm in a way that obscures the cryptanalytic attack or that eliminates the cipher's weaknesses. Our focus is on this kind of changes, using as a specific case the CAST-128 cipher The changes we consider refer to the algorithm's substitution boxes and since the creation of good substitution boxes is a highly time consuming process, we also provide a parallel algorithm for completing this task quickly.
Date of Conference: 02-05 July 2002
Date Added to IEEE Xplore: 07 November 2002
Print ISBN:0-7695-1588-6
Conference Location: Vienna, Austria

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