The Research And Analysis Of Rijndael Algorithm

The block cipher is one of the two aspects of the modern applied cryptography systems. It has some characteristics - the fast speed, the easy standardization, convenient implement by software and hardware ,and so on. The block cipher always is the main parts of the data encryption, digital signature, authentication and key management in the security of information and network . So it is used in wide range either in the security area of the computer communication or in the security area of the information system.The design and the analysis of the block cipher not only are contrary but also are dependent each other. And the contradiction between them promotes the fast development in the block cipher.This paper is mainly discussed with Rijndael algorithm. After seriously learning the its design principle, the way or algorithm that we compute the reverse of a polynomial in the different fields in Rijndael are advanced. Then we optimize the Sbox, round transformation, storage way of states. Finally, by studying the key schedule of Rijndael that is easy to uncover the seed keys, I put forward a new way to solute it. This new algorithm takes the Snowslide and the relation of them into accout .More, an ameliorate of the key arrangement is discussed. And executed by ANSI C implement.