A method and system for exchanging cipher watermarking based on modular operation

Abstract

The invention discloses a password watermark exchange method and a system based on modular operation. The method comprises the following steps of: converting a copyright identifier into binary watermark information according to the copyright identifier; reading the data to be embedded with the watermark; generating a ciphertext in an integer form based on the key and the random number generator; for the numerical value of the carrier data, increasing an integral multiple of the die length to realize encryption and storing a die length parameter; carrying out modular operation on numerical values in the carrier data, and modulating and embedding watermarks into the rest of the numerical values in a quantized manner; during decryption, generating a ciphertext in an integer form by using random number generators with the same parameters according to the encrypted secret key, and reducing the numerical value of the carrier data by an integer multiple of the module length to realize decryption; when the watermark is detected, modular operation is carried out on carrier data, and the watermark is extracted by using quantitative modulation. According to the method, related characteristicsin modular operation are fully utilized, a security protection scheme that cryptology and digital watermarks are jointly implemented in the same domain of carrier data is achieved, and the security and reliability of password watermark exchange are improved.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method and system for exchanging cipher watermarks based on modular operations. Background technique [0002] The security protection technology of multimedia data mainly includes cryptography and digital watermarking. Cryptography can convert plaintext multimedia data into ciphertext, thereby protecting the security of multimedia data during transmission and distribution, and technically preventing losses caused by illegal theft and leakage during multimedia data distribution. Digital watermarking is to embed copyright information, user information and other identifiers in the data to realize the functions of data copyright protection, usage tracking, leak tracking and so on. Compared with encrypted security protection methods, digital watermarks can permanently exist in vector geographic data, and realize continuous tracking of data in the process of circulation and use. ...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing implementation mechanisms of multimedia data exchange cryptographic watermarking include domain division, homomorphic encryption, and statistical features, but these methods have defects in security, efficiency, and robustness, and it is difficult to achieve reliable multimedia data. High performance and good practical safety protection

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