Study on improved Rijndael encryption algorithm based on prefix code

Abstract

Aiming at problem that Rijndael algorithm can be attacked by Square attacks, an improved Rijndael algorithm method which is based on prefix codes is put forward. Due to the good Characteristics in decoding of prefix codes, the method will change the order of sub-keys through the procedure of decrypting different plaintext inputted by prefix codes, and make the order relate with the plaintext, in other words, it makes the system be variable. With the improvement it has no effect on the efficiency, but it can resist the Square attack fundamentally. © 2012 Springer-Verlag GmbH.