Design strategy research on realizing scheme of Rijndael algorithm
WU Heng-bai · Jisuanji gongcheng yu sheji · 2008
In Round in Rijndael we Merge different steps of SubBytes, ShiftRows, MixColumns and AddRoundKey as several tables to search instead of the relative calculations.According to the quick realizing, another kind of module-multiply factor tables(M tables) based on MixColumns is put forward.It can be served as a complement for S-box, lg tables, alg tables and T tables.In combination with the tables, Rijndael is realized effectively.By using the character that MixColumns can pierce through AddRoundKey, Rijndael decrypted course is reconstructed and it has the similar structure with its encrypted course.Thus.The same optimization strategy is adopted as encrypt algorithms and the equivalentdecipher algorithms is designed.In the end, three schemes of realizing Rijndael algorithm are summed and the expenses analysis of each is presented.