Image hiding and authentication method based on secret sharing

Abstract

The invention discloses an image hiding and authentication method based on secret sharing, and belongs to the technical field of secret image sharing. The image hiding and authentication method is characterized by comprising the steps that firstly, difference Huffman encoding is conducted on a secret image, every three generated bit sequences are set to be one group to be converted into decimal numbers which are used as coefficients of a sharing polynomial in the Shamir (k, n) threshold scheme, the k and the n are positive integers, the k is smaller than or equal to the n, and n shadow images are generated; secondly, n significant carrier images are selected, the generated shadow images are embedded into the carrier images in a matrix encoding mode, authentication bits generated by the hash function are also embedded into the carrier images, and n disguise images are formed and are in the charge of n different participants respectively. The disguise images generated through the image hiding and authentication method has higher visual quality, existence of secret information cannot be perceived by attackers easily, and the safety of the secret information is ensured. Meanwhile, before the secret information is recovered, the disguise images provided by each participant need to be authenticated, only the disguise images passing through authentication can participate in recovery of the secret information, and the safety of the secret information is further strengthened.

Description

technical field [0001] The invention belongs to the technical field of secret image sharing, in particular to an image hiding and authentication method based on secret sharing. Background technique [0002] As an important technology of information security in the network era, information hiding has become a new research hotspot in information security in recent years. Information hiding technology is to hide a certain secret information in another public media information in some way, and transmit the secret information through the transmission of public information. The purpose of this technology is to hide the existence of secret information, so that any third party except the communication parties will not be aware of the existence of secret information, thereby providing further protection for digital media. In addition, the authenticity and integrity of digital images have become the focus of multimedia information security, and image authentication is an important te...

AI Technical Summary

Problems solved by technology

However, although these schemes have improved the authentication ability and camouflage image quality, they still have two problems: (1) Each element in the shadow vector is sequentially hidden in each cover image block. When the number of elements in the embedded shadow vector is less than the number of blocks in the cover image, there is no secret information embedded in some blocks of the cover image. Therefore, the statistical characteristics of the part embedded with secret information and the part without secret information in the camouflage image will have A noticeable difference that would attract the attention of an attacker, reducing the security of secret information

(2) The previous schemes all use the LSB replacement method to hide secret information. This method can easily detect the existence of embedded information by steganalysis such as RS analysis, and can accurately determine the length of embedded information. This also gives The scheme brings certain security risks

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