SP network structure lightweight LBT block cipher realizing method with consistent encryption and decryption

Abstract

The invention discloses an SP network structure lightweight LBT block cipher realizing method with consistent encryption and decryption. The invention provides an SP network cipher structure with consistent encryption and decryption. The cipher structure is same with a Feistel network cipher structure. One algorithm is utilized in encryption and decryption, and designing of a special decryption algorithm is not required. According to the cipher structure, a plaintext data input direction for encryption is same with a cipher text data input direction for decryption. The designed cipher structure is realized as a lightweight LBT block cipher algorithm. A user selects different secret key length cipher algorithms according to an application occasion requirement. The SP network structure lightweight LBT block cipher realizing method has advantages of settling a bottleneck of high difficulty of realizing consistent encryption and decryption based on the SP network structure password, realizing high encryption speed and high decryption speed of the LBT cipher, facilitating software and hardware realization, reducing software resource and hardware resource, and realizing high suitabilityfor use as the lightweight block cipher.

Description

technical field [0001] The invention relates to the technical field of data transmission security, in particular to a method for realizing a light-weight LBT block cipher of SP network structure with consistent encryption and decryption. Background technique [0002] A cryptosystem refers to a cryptographic scheme that implements encryption and decryption. The so-called encryption and decryption usually occur in pairs. With encryption, there is decryption. Among the cryptosystems, the symmetric block cipher system algorithm has the advantages of high speed and high efficiency, which is suitable for the application scenarios of large-scale data encryption, and is one of the mainstream directions of modern cryptography. Among the block cipher algorithms, there are three cipher structures, Feistel network structure, SP network structure and Lai-Massey network structure. Among these three structures, Feistel network structure and SP network structure are the two most commonly u...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is: provide a kind of consistent encryption and decryption SP network structure lightweight LBT block cipher implementation method, it can solve the bottleneck that is difficult to achieve consistent encryption and decryption based on SP network structure cipher; The problem of low security in the level block cipher algorithm technology

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