Ciphertext domain reversible information hiding method and software and hardware application system

Abstract

The invention discloses a ciphertext domain reversible information hiding method, which comprises the following steps of: (1) preprocessing and encrypting a plaintext to obtain a ciphertext; (2) embedding the encrypted additional information into a ciphertext to obtain a first secret-carrying ciphertext; (3) secondarily embedding ciphertext LSB information based on key replacement into the first secret-carrying ciphertext, and finally obtaining the secret-carrying ciphertext; wherein the ciphertext LSB information based on key replacement is data obtained by encrypting additional information;(4) carrying out LSB extraction on the secret-carrying ciphertext, and extracting secondary embedded additional information; and processing the secret-carrying ciphertext through ciphertext domain information extraction and carrier recovery or plaintext domain information extraction and carrier recovery to obtain an original plaintext and additional information embedded for the first time. The invention further discloses a ciphertext domain reversible information hiding system, computer equipment and a readable storage medium, and efficient and large-capacity embedding of data and reversible recovery of carrier data are guaranteed on the premise that separable ciphertext domain reversible information hiding is met.

Description

technical field [0001] The invention relates to information hiding, information encryption and ciphertext domain data processing technology, in particular to a ciphertext domain reversible information hiding method and a software and hardware application system. 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 sign...

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

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