Authorized identity-based search encryption method with a keyword

Abstract

The invention discloses an authorized identity-based search encryption method with a keyword. The method comprises the following steps of: initializing a system; a user private key generation step; anauthorization certificate issuing step; generating public and private keys which can be authorized and encrypted; an encryption step with keyword search; a search trap door generation step; cloud server search test step. The method provided by the invention has an authorization function; the application flexibility is relatively high; the proxy uploading problem of searchable encrypted files canbe solved; an original data owner is supported to authorize an agent to help the agent upload a ciphertext of plaintext information and a ciphertext of a keyword to a cloud server, the characteristicof keyword guessing resistance is provided, the server cannot guess the keyword being queried by a user, and the information security of cloud data is effectively guaranteed.

Description

Technical field [0001] The invention relates to the technical field of cyberspace security, in particular to an authorizable identity-based search encryption method with keywords. Background technique [0002] With the rapid development of cloud computing, a large number of companies, institutions, and organizations choose to encrypt data and store it in the cloud, and retrieve the data when needed. Under this model, encrypted files are always stored on the cloud server, and the cloud administrator cannot see the data content in plaintext, so the expected data cannot be accurately returned. When searching for data that meets a specified keyword, the traditional method is to retrieve all the data that may contain this keyword in the cloud, decrypt it, and find out the required content from the decrypted data. As the amount of data in the cloud increases, retrieving data is an increasingly onerous task, and it also puts a severe test on users’ network access bandwidth; when the am...

AI Technical Summary

Problems solved by technology

[0005] At present, although some data searchable methods have emerged, these methods hardly have the characteristics of being resistant to internal keyword guessing attacks and being proxyable at the same time.

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