A novel key generation shield block cipher implementation method, device and readable storage medium

Abstract

The invention discloses a method, device and readable storage medium for realizing a Shield block cipher for generating a new type of key. The Shield block length of the method is designed to be 128 bits, the key is of any length, the encryption round function is based on the SPN structure, and the encryption sequence is The sequence is round key addition, S-box replacement, row shift and column mixed transformation. The key expansion function divides the original key into three parts, and uses the hash function MD5 to generate three round keys, which are used in different rounds of round key addition operations. S-box replacement transformation uses two 4×4 S-boxes to perform 128-bit data replacement transformation, and divides the data into 32 4-bit units. As the number of encryption / decryption rounds changes, the data units are replaced by corresponding S-box increments / decrements. operate. The Shield cipher occupies a small area and resources, which reduces the storage space for saving the original key. By increasing the key length and expanding the key space, it can well resist known attacks.

Description

technical field [0001] The invention relates to a novel key generation Shield block cipher realization method, device and readable storage medium. Background technique [0002] In recent years, the development of supercomputers in the world has been advancing by leaps and bounds. Its computing power has been showing exponential growth in recent years. The security of cryptographic systems and cryptographic algorithms has received serious impact. Using powerful computing power to carry out the most basic brute force attack method to crack the key of the password. The key length determines the number of possible keys, so increasing the key length increases the difficulty of cracking. After DES is cracked, the 3DES scheme is adopted to improve the security of the cryptographic algorithm by increasing the key length, while AES As for the encryption algorithm, the AES algorithm with a key length of 256 bits is used for encrypted transmission of highly confidential information. ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a Shield block cipher implementation method, device and readable storage medium related to a new type of key generation. Attacks and the 8×8 fixed S-box occupying a lot of resources and other issues

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