Group AES encryption and decryption method

Abstract

The invention discloses a group AES encryption and decryption method, which comprises the following steps of: 1, arranging input data into a 4*4 byte state matrix, and performing Nr encryption iterative operation according to different key lengths; 2, adding an initial secret key, and carrying out formwork on the data and the secret key; 3, performing Nr-1 times of round change processing, whereineach time of round change is composed of four parts, S box replacement is conducted on input data, and row shifting operation is conducted on the data obtained after S box replacement; and performinga column mixing operation on the data after the row shift operation, and performing a round key addition operation according to the sub-key of the previous round. According to the invention, the encryption part and the decryption part are completed in the same FPGA, the execution of the encryption process and the decryption process does not influence each other, the parallel completion is realized, the actual use is convenient, the execution speed of the encryption process and the decryption process is high during the actual use, and the encryption and decryption efficiency is significantly improved.

Description

technical field [0001] The invention relates to the technical field of cryptography, in particular to an AES encryption and decryption method. Background technique [0002] Password is an important means of confidentiality for the two parties in communication to carry out special transformation of information according to the agreed rules. According to these rules, changing plaintext into ciphertext is called encryption transformation; changing ciphertext into plaintext is called decryption transformation. In the early days, passwords only performed encryption and decryption transformations on text or numbers. With the development of communication technology, encryption and decryption transformations can be implemented on voice, images, data, etc. AES encryption algorithm is an advanced encryption standard in cryptography. It has the advantages of security and stability, and has become one of the most popular algorithms in symmetric key encryption. It is widely used in vari...

AI Technical Summary

Problems solved by technology

In the early days, passwords only performed encryption and decryption transformations on text or numbers. With the development of communication technology, encryption and decryption transformations can be implemented on voice, images, data, etc. AES encryption algorithm is an advanced encryption standard in cryptography. It has the advantages of security and stability, and has become one of the most popular algorithms in symmetric key encryption. It is widely used in various security fields. The realization of encryption algorithms can be divided into software direction and hardware direction. However, considering the security and speed defects of the encryption algorithm implemented by software, people are more inclined to use hardware to implement the encryption algorithm. However, in the existing technology, the encryption and decryption process of the AES encryption and decryption method is completed asynchronously, and the encryption and decryption execution speed is slow.