Ciphertext domain reversible-data-hiding (RDH) method based on left and right shifting of histogram

Abstract

The invention discloses a ciphertext domain reversible-data-hiding (RDH) method based on left and right shifting of a histogram. Full encryption under carrier non-extension is realized through additive homomorphic encryption and block scrambling encryption, left and right shifting of the prediction error histogram of a carrier is utilized for double embedding of information, and balancing of a high embedding rate of a ciphertext domain and reversibility is maintained. The method comprises: an encryption phase, wherein homomorphic encryption and scrambling encryption are carried out on the carrier by a content owner through encryption keys, and a ciphertext carrier is generated; an information hiding phase, wherein information embedding is carried out by an information hider through left and right shifting of the prediction error histogram according to embedding keys, and a cipher carrying ciphertext carrier is generated; and an information extraction and carrier decryption phase, wherein the encryption keys are used by a valid recipient to directly decrypt the cipher carrying ciphertext carrier, and a carrier which is highly similar to the original carrier can be obtained, or the encryption keys and the embedding keys are used by the valid recipient, and ciphertext information and the original carrier can be obtained without distortion. Compared with the prior art, the method has the advantages that a better security guarantee is provided while the ciphertext carrier is not expanded, an information embedding rate of up to 2 bit / bit can be provided on the premise of completereversibility, the carrier is not limited to images, the method has scalability for continuous multimedia carriers, and the method has higher practical significance.

Description

technical field [0001] The invention relates to the fields of signal encryption and information hiding, in particular to a method for reversible information hiding in a ciphertext domain based on the left and right translation of a histogram. Background technique [0002] Technologies such as third-party cloud storage provide great convenience for the access of digital information media, but also bring serious data security and privacy requirements. As an important branch of information hiding technology, reversible information hiding (RDH) can meet the requirements of information embedding and undistorted recovery carrier at the same time, and is suitable for scenarios with high requirements for data authentication, especially remote sensing applications, military communications, medical applications, multimedia management and other fields. Reversible information hiding in ciphertext domain (RDH-ED), as a combination of ciphertext signal processing technology and informati...

AI Technical Summary

Problems solved by technology

[0005] The existing reversible information hiding algorithms in the ciphertext domain are usually difficult to take into account the characteristics of high embedding rate, high reversibility, security and encrypted data do not expand or expand little, and usually focus on the research of image signals, which limits the breadth of application

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