Research and implementation of the block cipher algorithms
LU Chang-jiang · Journal of Chengdu University of Technology · 2006
This paper researches the shortcomings of the insecurity based on differential cryptoanalysis of the DES and the inefficient 3-DES algorithm.A Rijndael algorithm is proposed to implement the encryption of any files in this paper.The block structure and the S-box of the algorithm take the multiplicative inverse in the finite domain GF(2~8)to improve the security and efficiency.A large number of tested results show that the Rijndael algorithm is more secure and effective.The paper also gives the mathematical expressions of the DES algorithm.