A multi-bit reversible information hiding method in ciphertext domain

Abstract

The invention provides a ciphertext domain multi-bit reversible information hiding method capable of effectively ensuring large volume embedment of data, reversible recovery of carrier data and undetectability of embedded information on the premise of meeting separable steganography. The method comprises the following steps: 1, parameter setting and data pre-processing; 2, encryption and information embedment; and 3, decryption and information extraction. By recoding ciphertext data based on an R-LWE (Ring Learning with Errors) public key cipher algorithm, a user can embed multi-ary information based on ciphertext domain operation to realize data encryption. After the information is embedded, the user can effectively extract the hidden information with a steganographic key and recover the data before encryption without errors by using a decryption key. Compared with the existing ciphertext domain steganography, the method has the advantages that error-free decryption of the embedded ciphertext and effective extraction of the hidden information can be realized, and the decryption and extraction processes are separable.

Description

technical field [0001] The invention relates to information hiding, information encryption and ciphertext domain data processing technology, in particular to a multi-bit reversible information hiding method in ciphertext domain. Background technique [0002] Since its birth in the 1990s, information hiding has played an increasingly important role in the field of information security. However, most steganography algorithms permanently damage the data in the original carrier signal while embedding secret information, and introduce certain distortion. However, these distortions are unacceptable in some applications that require high data authentication and restore the original carrier without distortion, such as remote medical diagnosis, encrypted data annotation in the cloud environment, military and legal affairs, etc. In military, medical and other fields, not only secret information has extremely high value, but also original carrier signal is indispensable. For example,...

AI Technical Summary

Problems solved by technology

However, the existing ciphertext domain reversible information hiding technology has many difficulties and problems in terms of effectively ensuring large-capacity data embedding, reversible recovery of carrier data, and undetectability under the premise of realizing separable steganography, because modern encryption algorithms require plaintext The minimal change of will also spread to the entire ciphertext space, and the design of the reversible algorithm is often independent of the encryption algorithm, so that the more encrypted data is modified during the embedding process, the greater the distortion of the decryption result will be

In addition, the encrypted data has the characteristics of uniform distribution in the statistical sense. The existing reversible steganography algorithm in the ciphertext domain ensures that the statistical characteristics remain unchanged before and after embedding, that is, the research on the ability to resist steganalysis is still relatively elementary.

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