Graded-and-grouped secret image sharing method

Abstract

The invention discloses a graded-and-grouped secret image sharing method, and belongs to the technical field of secret image sharing. The graded-and-grouped secret image sharing method comprises the step of graded decomposition, sharing and concealing of a sending end to a secrete image, and the step of grouped gradual recovery of a receiving end to the secret image. The sending end firstly decomposes the secret image into sub-secret-images of different grades through bit decomposition, then carries out sharing on the sub-secret-images to enable the sub-secret-images to become a set of shadow images through the Shamir threshold scheme, and conceals the shadow images of different sets in different concealing images to distribute the shadow images to different participants in different authority groups. The receiving end can recover the set of sub-secret-images only on the situation that the same authority group provides k or more than k concealed images, and gradual recovery of the secret image can be achieved when different authority groups carry out superposition on the recovered sub-secret-images. The graded-and-grouped secret image sharing method has the advantage that the secret image can be shared by a plurality of sets of participants with different administration authority according to the actual requirements.

Description

technical field [0001] The invention belongs to the technical field of secret image sharing, and in particular relates to a hierarchical-group secret image sharing method. Background technique [0002] With the development of computers and digital multimedia, more and more digital images are transmitted through the network. Therefore, the security and confidentiality of network transmission have become more and more important issues, especially for some military and commercial image information. Information security is even more important in fields that require high integrity and security. However, the digital image has a large amount of data, high redundancy, and strong correlation between pixels, so the early digital and digital encryption methods can no longer meet the requirements of digital image encryption. [0003] Secret image sharing technology (Secret image sharing) is an encryption technology applied to images, which splits the original secret image into n A noi...

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Problems solved by technology

[0005] The above four schemes all share one or more secret images with a group of people. However, in some practical situations, it may be necessary to share secret images with multiple groups of participants with different management rights. For example, in an enterprise, according to the participant Different levels (such as chairman and general manager) allow them to have different management rights of secret images; and multiple participants in the same group, although they have the same management rights, also need to restrict each other and jointly manage secret information , at this time, the above four schemes cannot adapt to the application of this occasion

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