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Digital content encryption and decryption method based on ARX white-box block cipher

A digital content and block cipher technology, applied in the field of network information security and information security, can solve the problems of high storage space cost, high storage space cost of decryption method, low operation efficiency of encryption method and decryption method, and achieve the speed of encryption and decryption Fast, low-cost decryption storage space

Active Publication Date: 2021-10-22
XIDIAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and propose a digital content encryption and decryption method based on ARX white-box block cipher, to solve the problems of low operating efficiency of the encryption method and decryption method and too high storage space cost of the decryption method
Because the operation of ARX has fast arithmetic implementation instructions, the round function of AES-128 has fast implementation instructions of AES-NI, which solves the problem of low operating efficiency of encryption and decryption methods
Since the decryption method only queries a 32-bit input and 32-bit output lookup table, the storage space occupied by it is 16GB, which solves the problem that the storage space cost of the decryption method is too high

Method used

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  • Digital content encryption and decryption method based on ARX white-box block cipher
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  • Digital content encryption and decryption method based on ARX white-box block cipher

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] refer to figure 1 , to further describe the implementation steps of the present invention.

[0048] Step 1, generate an encryption key.

[0049] Use the key derivation function KDF to transform a 128-bit master key into 25 32-bit round keys k 0 ,k 1 ,...,k i ,...,k 24 , as the encryption key for the digital content.

[0050] The key derivation function KDF refers to any one of the output scalable functions SHAKE128 and SHAKE256 in the secure hash algorithm family.

[0051] Step 2, generate a decryption key by using the ARX cycle operation.

[0052] S1: set 2 32 A 32-bit bit string 0, 1, 10, ..., 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 with the initial round key 0 XOR, get 2 after XOR 32 A 32-bit bit string. ...

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Abstract

The invention discloses a digital content encryption and decryption method based on ARX white-box block cipher, and mainly solves the problems that the encryption and decryption method in the prior art is low in operation efficiency and the decryption method is too high in storage space cost. The method comprises the following steps: executing a loop operation of ARX and a round function operation of AES-128 in encryption, and executing an inverse round function operation of AES-128 and a query operation on a 32-bit input and 32-bit output lookup table in decryption. The cyclic operation of the ARX refers to addition, rotation and XOR operation. The round function operation of the AES-128 refers to key pre-whitening operation, byte substitution operation, row shifting operation, column confusion operation and round key addition operation. The operation efficiency of the encryption and decryption method is higher than that of the prior art, and the storage space cost of the decryption method is lower than that of the prior art.

Description

technical field [0001] The invention belongs to the technical field of network information security, and further relates to a digital content encryption and decryption method based on modular addition, cyclic shift, XOR (Addition, Rotation, XOR) white-box block cipher in the technical field of information security. The present invention can be used for encrypting and decrypting digital content to achieve the purpose of copyright protection. Background technique [0002] With the advent of the electronic age, the carrier of audio-visual content has gradually changed from physical equipment to digital form. Although digital content is easier to produce, distribute, and store, the task of protecting digital content is becoming more difficult. Digital rights management is to use access control technology to protect the copyright of digital content, specifically, to restrict the use, modification and distribution of digital assets. Classic DRM systems, such as Microsoft's Windo...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/06G06F21/10
CPCH04L9/0894H04L9/0618H04L9/0631H04L9/0643G06F21/10H04L2209/16
Inventor 刘君陈杰罗一诺
Owner XIDIAN UNIV
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