FPGA IMPLEMENTATION OF ENCRYPTION AND DECRYPTION RIJINDAEL’S ALGORITHM BASED ON AES

Abstract

With the rapid development and wide application of computer and communication networks, the information security has aroused high attention. Information security is not only applied to the political, military and diplomatic fields, but also applied to the common fields of people’s daily lives. With the continuous development of cryptographic techniques, the long-serving DES algorithm with 56-bit key length has been broken because of the defect of short keys. The "Rijndael encryption algorithm" invented by Belgian cryptographers Joan Daemen and Vincent Rijmen's had been chosen as the standard AES (Advanced Encryption Standard) algorithm whose packet length is 128 bits and the key length is 128 bits, 192 bits, or 256 bits. Since 2006, the Rijndael algorithm of advanced encryption standard has become one of the most popular algorithms in symmetric key encryption. AES can resist various currently known attacks. This paper presents FPGA based implementation scheme of advance encryption standard AES-128 (with 128 bit Key) encryption and decryption algorithm. The advance encryption standard is a symmetric block cipher that is intended to replace DES as the approved standard for a wide range of application. The 128-bit plain text and 128-bit initial key, as well as the 128-bit output of cipher text, are all divided into four 32-bit consecutive units respectively controlled by the clock