Ciphertext domain multi-bit reversible information hiding method
An information hiding, multi-bit technology, applied in the field of multi-bit reversible information hiding in the ciphertext domain, which can solve the problems of distortion of decryption results and primary problems.
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[0050] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0051] The invention discloses a multi-bit reversible information hiding method in a cipher text domain. By re-encoding the cipher text data based on the R-LWE (Ring-Learning With Errors) public key cryptographic algorithm, users can embed multi-ary information in the cipher text. For the ciphertext after embedding information, the user can effectively extract the hidden information by using the steganographic key, and recover the data before encryption without error by using the decryption key, and the extraction process can be separated from the decryption process.
[0052] Specifically include the following steps.
[0053] Step 1, parameter setting and data preprocessing.
[0054] (1) Select a security parameter k>1 which is a natural number, n=2 k , ring R q All elements and operation ...
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