A method and device for implementing a lightweight block cipher scs

Abstract

The invention discloses a method and apparatus for implementing a lightweight block cipher SCS. A turn key and a control key are divided in keys, the round key participates in a round key adding operation, the control key controls the generation of each turn of S box to obtain a random S box, the update of the control key and the turn key is related to the operation result of the last turn, the Sbox used in each turn is random, the operation result of each turn is also random, so that the degree of confusion can be increased; in a round function, a high pseudo-random P permutation is generated by the Mason rotation algorithm in each round to achieve the diffusion, and after the end of the round function iteration, row shift and the column confusion transform are executed, so that the diffusion effect is enhanced by using the dual diffusion mode, and the security is improved. Compared with the situation that the difference between the resource consumption of fixed cipher structures isnot large, the internal structure of the device has the advantages of greatly improving the security of the scheme, and increasing the defense coefficients of linear attack, differential attack and the like to a certain extent.

Description

technical field [0001] The invention belongs to the field of information security, in particular to a method and device for realizing a lightweight block cipher SCS. Background technique [0002] In recent years, with the rapid development of network, microelectronics and information technology, the Internet of Things, as a typical representative of the new generation of informatization, is penetrating into all aspects of human production and life, such as smart cities and transportation, modern logistics and environmental monitoring etc. However, data security in the Internet of Things field cannot be solved by traditional block ciphers due to its limited resources, weak computing power, and limited storage capacity. Therefore, lightweight block cipher algorithms that adapt to resource constraints have emerged as the times require. Scholars in related fields have also begun to do a lot of research on lightweight ciphers, which mainly focus on the design of lightweight ciph...

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Problems solved by technology

[0009] The present invention provides a method and device for implementing a lightweight block cipher SCS, the purpose of which is to overcome the problem that one round of iterative operation of the Feistel network structure algorithm in the prior art can only change part of the packet data, and the degree of diffusion and confusion is not high; The control process and method of the key participating in the module operation are too simple, and the implementation process of different digits of the key or the number of encryption rounds are different, resulting in too much resource consumption; the diffusion and confusion methods are too simple and the steps are complicated, and the efficiency is not high; the algorithm encryption process The calculation and transformation module is fixed, which increases the possibility of being attacked and analyzed, and the problem of low security

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