Lightweight block cipher algorithm Shadow implementation method and device and computer readable medium

Abstract

The invention discloses a lightweight block cipher algorithm Shadow implementation method and device based on an SPN structure and a computer readable medium. The method comprises the following steps:obtaining a 64-bit plaintext to be encrypted, and determining an iteration round number R according to the number of key bits; in the first round of operation to the Rth round of operation, enablingeach round of operation to be sequentially subjected to round key addition operation, nonlinear S-box replacement operation, row displacement operation and linear column hybrid operation, and updatinga key; taking the data obtained after the linear column hybrid operation as the to-be-encrypted data of the next round of operation, and taking the updated key as the key of the next round of operation; and performing round key addition operation on the data after the Rth round of operation and the key, and outputting a ciphertext. On the basis that part of cryptographic indexes of the S box arenot affected by affine transformation, a composite affine mathematical method is adopted, the pseudo-random key related S box is constructed on a finite field GF (24), meanwhile, a column hybrid matrix is constructed according to the Schmidt matrix orthogonalization principle, and attacks can be effectively resisted.

Description

technical field [0001] The invention relates to the field of computer encryption, in particular to a method, device and computer-readable medium for realizing a lightweight block cipher algorithm Shadow based on an SPN structure. Background technique [0002] In recent years, data security issues in the fields of financial services, smart cards, retail, and autonomous vehicles have become more and more prominent, which has aroused widespread concern about data confidentiality, privacy protection, and personal data security. Because traditional block ciphers are not suitable for low-cost, low-power resource-constrained application environments such as RFID tags and sensor nodes, research on lightweight block ciphers suitable for such resource-constrained environments is currently an international Hot issues in cryptography research. [0003] Compared with traditional block ciphers, lightweight block ciphers have the following characteristics: (1) resource-constrained applica...

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Problems solved by technology

[0005] The present invention provides a light-weight block cipher algorithm Shadow implementation method, device and computer-readable medium based on the SPN structure. attack problem

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