Optimized design of S box based on AES encryption algorithm
Bowen Yi · Microcomputer Information · 2012
This paper tentatively put forward a new kind of S box optimized design scheme. The first step in the improved S box algorithm generating process is to search the best affine transform couple, and then do one affine transform to byte selements, then search for the multiplicative inverses, finally do one affine transform again. Compared with the original S box, the improved S box ’s algebraic expression item number reaches 253 items . affine transform period is 16, strict avalanche criterion distance is close to 370, iterative output cycle is 256. While in the balance, strict avalanche criterion, non-linear degree etc, the improved S box keeps the traditional S box ’s algebraic properties.