Multi-mechanism encryption method used in lattices for supporting strategy hiding

Abstract

The invention discloses a multi-mechanism encryption method used in lattices for supporting strategy hiding. The multi-mechanism encryption method comprises steps that S1, during system initialization, a public parameter and a system main private key are generated; S2, a user applies for a cipher key for own attribute, and an attribute mechanism is used to generate a private key according to the public parameter, the system main private key, and the attribute set of the user; S3, an access structure is converted into a corresponding access tree to realize complete hiding of an access strategy;S4, a data owner is used to generate the ciphertext data according to the public parameter, a plain text, and the converted access tree, and the ciphertext data is uploaded to a cloud server for storage; S5, the user transmits an access request to the cloud server to acquire the ciphertext data stored in the cloud server; S6, the user uses the private key acquired from the attribute mechanism todecrypt the ciphertext data acquired from the cloud server, and the plaintext of the data owner is acquired, and related subsequent operations are carried out. The multi-mechanism encryption method isadvantageous in that the efficiency of the system is improved, and quantum attacks are prevented, and user privacy is effectively improved.

Description

technical field [0001] The invention relates to the technical fields of cloud environment and cryptography, in particular to a multi-mechanism encryption method supporting policy hiding on a grid. Background technique [0002] With the development of information technology, there are more and more private and enterprise data, presenting the form of big data, which promotes the development of cloud computing, and people are more and more inclined to store data in the cloud, which is convenient and saves costs and resources, especially For some small and medium enterprises. However, while bringing convenience, there are also some problems, especially the cloud storage security incidents that have occurred continuously in recent years. People store data in the cloud. These data will inevitably contain users’ private information, and users will lose access to sensitive data. Cloud servers may access the data they are interested in out of curiosity or commercial interests, and i...

AI Technical Summary

Problems solved by technology

At the same time, most of the lattice-based encryption methods are managed by a single trusted organization, which is not very secure and does not meet the actual application needs.

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