A method for exchanging cryptographic watermarks in the same operation domain based on homomorphic properties

Abstract

The present invention provides a method for exchanging cryptographic watermarks based on homomorphic characteristics, which includes encrypting watermark plaintext to obtain multimedia information data watermark ciphertext, embedding watermark information in the ciphertext domain to obtain multimedia information data watermark ciphertext, and extracting embedded watermark information. part design. Compared with the prior art, the present invention utilizes the homomorphic characteristics of the cryptographic algorithm to realize the mutual mapping of the watermark algorithm embedding operation between the ciphertext domain and the plaintext domain of multimedia information data, that is, the digital watermark embedding algorithm related operations in the plaintext domain can be realized. It is converted into corresponding operations in the ciphertext domain, so as to realize the related operations of the watermark embedding algorithm in the plaintext domain in the ciphertext domain. At the same time, with the help of the characteristic of single plaintext and multiple ciphertexts in the cryptographic algorithm, the watermark information in the plaintext domain is mapped to the ciphertext domain, so as to realize the watermark embedding and extraction in the ciphertext domain.

Description

technical field [0001] The invention belongs to the technical field of multimedia information security protection, and in particular relates to a method for exchanging password watermarks in the same operation domain by combining encryption technology and digital watermark technology by utilizing the homomorphic characteristics of cryptographic algorithms. Background technique [0002] Since entering the digital network society, the security of digital multimedia information has always been a hot spot of concern. Digital multimedia information content security mainly includes two requirements: data security during access and data security during use. Cryptography and digital watermarking are the key technical means of these two different aspects. In order to realize the in-depth and comprehensive security protection of digital multimedia information, it is proposed to combine cryptographic technology with digital watermarking technology. Commutative Encryption and Watermar...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a new method for realizing CEW based on the homomorphic characteristics of cryptographic algorithms, which can combine cryptographic algorithms and digital watermarking algorithms in the same operating domain, and effectively solve the problem of security insecurity of the existing orthogonal exchange cryptographic watermarking technology in the operating domain. High shortcomings, truly realize the seamless combination of multimedia data content encryption and digital watermark embedding in time and space, and are independent of each other in operation

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