A new algorithm of S-box for hardware implementation of SMS4
Guo Li · 2009
In order to solve the problem of the implementation algorithm of S-box based on the inversion transformation over Galois field,methods such as composite field computation,altering calculation order and sharing factors have been used to optimize operations.A low hardware overhead implementation algorithm of S-box based on the inversion transformation approach from GF(28) to GF(22) was presented.Compared with the implementations based on look-up table method,this algorithm can reduce circuit area by 34%~68% using 0.18 μm and 0.35 μm CMOS technology.This design method can make SMS4 algorithm more suitable for area-critical devices.