Chinese character password encoding method based on image pixel coordinates

Abstract

The invention discloses a Chinese character password encoding method based on image pixel coordinates. The encryption process comprises the steps that (1), plaintext Chinese character strings are input, and the length K of each character string is fetched; (2), a public key image f1 and a private key image f2 are read to generate a private key image F, and the size M*N of the image is fetched; (3), each character is converted into binary data and segmented into a high byte block and a low byte block, and the high byte block and the low byte block are stored into a cellular array destr (i, 1) and a cellular array destr (i, 2) respectively; (4), pixel values matched with the cellular array destr (i, 1) and the cellular array destr (i, 2) are searched for in a circulating mode in the F, and pixel coordinates are read and stored into a two-dimensional matrix left (x, y) and a two-dimensional matrix right (x, y); (5), two coordinate values in the left (x, y) and the right (x, y) are fetched randomly for replacing the high byte block and the lower byte block of the character; (6), positions of four values of the two coordinates are changed according to an appointed position changing sequence, and the four values are output into a four-dimensional matrix (x, y, v); (7), when i is equal to K, the encryption process is finished, and the K-line four-dimensional matrix (x, y, v) is output to be a ciphertext. The encryption method has the advantages that privacy is good, and private key management is flexible and convenient, and is the safe Chinese character password encoding method.

Description

technical field [0001] The invention relates to a Chinese character cipher encoding method based on a digital image, is a new Chinese character encryption algorithm and a cipher encoding method, and belongs to the fields of cryptography and information security. Background technique [0002] With the popularization, application and development of computers and computer networks, information security and information security issues are becoming more and more important, and have even been raised to the strategic level of national security. Cryptography is one of the research focuses in the field of information security, and cryptography and cryptographic algorithms are the core content of cryptography. [0003] Typical of traditional cryptographic algorithms are substitution ciphers and transposition ciphers. Substitution ciphers indicate that each character / bit in the text is replaced with another character / bit in the ciphertext, including single-letter substitution, multi-l...

AI Technical Summary

Problems solved by technology

Encryption coders are enthusiastic about using various complex mathematical formulas, curves and matrices to study the encryption and security protection of images, including image hiding technology derived from traditional steganography, digital watermarking technology f

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