A Multi-Keyword Searchable Public Key Encryption Method

Abstract

The invention provides a public key encryption method supporting the searching of multiple keywords, used for solving the technical problem that the existing public key encryption method capable of searching multiple keywords is complex in ciphertext keyword computing process. The method comprises the implementation steps as follows: 1, a credible third party sets a public parameter; 2, a data owner sets a keyword field, a keyword vector and a query format of a storage file; 3, a credible third party computes keys of a cloud storage server and a data sharer; 4, the data owner encrypts the plaintext keyword in a plaintext keyword vector and sends the same; 5, the data sharer computes trap door information of the plaintext keyword in the plaintext keyword vector and sends the same; and 6, the cloud storage server searches the ciphertext keyword in a ciphertext set, and sends the searched ciphertext keyword to the data sharer. According to the invention, the ciphertext information and trap door information of the keyword can be transmitted under the public channel, and the keyword speculation attack can be resisted.

Description

Technical field [0001] The invention belongs to the field of data encryption technology, and specifically relates to a multi-keyword searchable public key encryption method, which can be used to realize efficient ciphertext retrieval in a cloud storage environment. Background technique [0002] With the emergence of cloud computing technology, computer and Internet technologies have reached new heights. People enjoy the convenience of data storage and data transmission brought by the Internet, but are also worried about the risk of data theft and leakage. In recent years, cloud computing technology has developed rapidly, and various security problems of cloud computing have also emerged. Data stored in the cloud is often attacked by malicious attackers from inside the server and from outside, although many security experts provide protection for data privacy However, the amount of stored data has gradually increased, and data types have gradually increased. Higher requirements ha...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that exists in the above-mentioned technology, has proposed a kind of multi-keyword searchable public key encryption method, is used to solve the ciphertext keyword existing in the existing multi-keyword searchable public key encryption method Complicated technical issues in the calculation process

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