Data symmetric encryption method for dual-plaintext transmission

Abstract

The invention discloses a data symmetric encryption method for dual-plaintext transmission. The method comprises the following steps: dividing original data into a plurality of plaintext groups; arranging the plurality of plaintext groups in sequence; dividing each plaintext group into a first original plaintext and a second original plaintext; processing the first original plaintext and the second original plaintext in each plaintext group by adopting a CBC mode to obtain a first new plaintext and a second new plaintext; encrypting the first new plaintext and the second new plaintext corresponding to each plaintext group by using a plurality of keys based on a Feistel structure to obtain a ciphertext corresponding to each plaintext group; and transmitting the ciphertexts corresponding to all the plaintext groups to a preset terminal so as to perform dual-plaintext encryption transmission on the original data. Based on the three-wheel Feistel structure, dual-plaintext encryption transmission can be carried out on the original data with the dual-plaintext feature, feasibility is achieved, and the safety in the original data transmission process can be enhanced.

Description

technical field [0001] The invention relates to the technical field of information encryption, in particular to a data symmetric encryption method based on double plaintext transmission of a three-round Feistel structure. Background technique [0002] The symmetric encryption method is a commonly used information encryption method in cryptography, and the symmetric key used in the symmetric encryption method ensures the security of the encrypted message. The well-known symmetric key standards include DES, 3DES, AES, etc. Among them, 3DES adds two rounds of encryption on the basis of DES, that is, performs three rounds of symmetric encryption based on the DES standard, thereby increasing the strength of encryption. At the same time, DES and AES also belong to the category of block ciphers, and block ciphers can also be divided into multiple modes, such as ECB, CBC, CFB, etc. Although there are many new and old encryption methods at present, there is a lack of targeted method...

AI Technical Summary

Problems solved by technology

However, it has been found through practical application that because the encryption and decryption method of the Bicycle method is based on a one-time function, there will be errors in the actual calculation process, which will affect the success of the decryption, making the Bicycle method unfeasible.

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