Method and device for realizing Shield block cipher generated by novel secret key and readable storage medium

A key generation and block cipher technology, which is applied in encryption devices with shift registers/memory, secure communication devices, digital transmission systems, etc. It can solve the problem that the key expansion function is not easy to save, vulnerable to attacks, and fixed S-boxes occupying resources Occupation and other issues

Active Publication Date: 2020-06-09
HENGYANG NORMAL UNIV
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Problems solved by technology

[0005] The present invention provides a Shield block cipher implementation method, device and readable storage medi...

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  • Method and device for realizing Shield block cipher generated by novel secret key and readable storage medium
  • Method and device for realizing Shield block cipher generated by novel secret key and readable storage medium
  • Method and device for realizing Shield block cipher generated by novel secret key and readable storage medium

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Embodiment Construction

[0084] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0085] A shield block cipher implementation method for new key generation. In this example, the implementation method of the Shield block cipher adopts the SPN structure, the block length is 128 bits, the key length is not fixed, and the iteration is 32 rounds. Shield encryption operation process is as follows: figure 1 As shown, it includes key generation function and encryption round function. The encryption round function operation includes round key plus transformation (AddRoundKey), S-box replacement transformation (SubCells), row shift transformation (ShiftRows), column mixing transformation (MixColumns) Four modules. The decryption operation flow is as follows figure 2 The algorithm decryption round operation includes four modules: column mix inverse transformation (InvMixColumns), row shift inverse transformation (InvShiftRows), S-box replace...

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Abstract

The invention discloses a method and a device for realizing a Shield block cipher generated by a novel secret key, and a readable storage medium. According to the method, the Shield grouping length isdesigned to be 128 bits, a secret key is any length, an encryption round function is based on an SPN structure, and the encryption sequence is round secret key addition, S box replacement, row shifting and column hybrid transformation in sequence. The secret key expansion function divides an original secret key into three parts, generates three round secret keys by using a hash function MD5, anduses the round secret keys in different rounds of addition operation. According to the S box replacement transformation, 128-bit data replacement transformation is carried out by adopting two 4 * 4 Sboxes; the data are divided into 32 4-bit units; and along with the change of encryption/decryption rounds, the data units respectively carry out corresponding S box increasing/decreasing replacementoperation. According to the invention, the occupied area resource of the Shield cipher is small; the storage space for storing the original secret key is reduced; and the known attack can be well resisted by increasing the length of the secret key and expanding the secret key space.

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. ...

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Application Information

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IPC IPC(8): H04L9/06
CPCH04L9/0618H04L9/0643
Inventor 刘波涛李浪李秋萍张剑赵军霞刘青云李永超黄莹
Owner HENGYANG NORMAL UNIV
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