Encrypted Image Reversible Information Hiding Method Based on Coding and Compression

Abstract

The invention discloses a reversible information hiding method of an encryption image based on coding compression. The method comprises steps of dividing an original image into a prediction region and a non-prediction region before encryption, calculating a pixel prediction vale of the prediction region so as to obtain a prediction difference value and carrying out lossless compression on the prediction difference value to obtain compression data; and randomly generating carrier data and carrying out image encryption and reconstruction on non-precision pixels, the compression data and the carrier data. In order to correctly restore the original image, code table hidden information should be determined and by hiding the code table information and the secret information in the carrier data, reversible hiding is achieved. For the carrier image, secret information is extracted in the carrier data; then, the non-prediction pixels and the compression data are decrypted; according to the code table information, the compression data is decompressed so that the prediction difference value is obtained; and finally, according to the non-prediction pixels and the prediction difference value, the original image is restored in a lossless manner. Compared with the prior art, the provided method has quite big hiding capacity; reversible hiding can be completely achieved; and the method has high actual application value.

Description

technical field [0001] The invention relates to the fields of information security and computer technology, in particular to a method for reversible information hiding of encrypted images based on encoding and compression. Background technique [0002] The reversible information hiding method of encrypted image is to directly embed secret information into the encrypted image without knowing the original carrier image, and recover the original carrier image without loss after decryption and information extraction. The carrier image is transmitted or stored in the form of ciphertext, while ensuring the security of the carrier image and secret information. It is widely used in military, commercial, medical and judicial evidence, etc., which have high requirements for carrier images. For example, when a patient's medical image is encrypted and uploaded to the hospital's server or cloud, the administrator can embed the relevant information of the image, such as owner information...

AI Technical Summary

Problems solved by technology

[0004] However, the existing reversible information hiding methods for encrypted images have small algorithm hiding capacity, and there may be errors between the restored image and the original image, so reversible hiding cannot be completely realized, and the practical application value is small

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