An Encryption Method Realizing the Key Isolation Property of Ciphertext Policy

Abstract

The invention discloses an encryption method for realizing the key isolation attribute of a ciphertext policy, comprising: cloud server initialization parameters; a data owner encryption key; a cloud server generating a key; a cloud server updating a key; and a data user updating a private key ; Data users generate trapdoor information; cloud server matching algorithm. The present invention does not need a secure channel for key transmission between data owners and data users, and introduces bilinear pairing operations to ensure data security and greatly reduce the possibility of key leakage; at the same time, the system life is divided into For several time periods, the public parameters of the system remain unchanged throughout the life cycle, and the private key of the data user will be refreshed from time to time. When the key is leaked, the private key of the data user can be updated in time to reduce the number of keys. The advantage of the damage caused by the leakage.

Description

technical field [0001] The invention relates to the technical field of data encryption, in particular to an encryption method based on keyword search and bilinear pairing operation to realize the key isolation property of a ciphertext policy. Background technique [0002] With the rapid development of the Internet, people can now realize various services such as online shopping and online remote medical monitoring through the Internet. Along with these services, a large amount of data is generated, and these data contain a lot of private data, such as home address and mobile phone number. Wait. Therefore, the protection of these data is very important. Encryption is an important means of providing security protection for these data. Through encryption, these data are converted into ciphertext and stored in cloud servers. [0003] There are many encryption technologies nowadays, and attribute-based encryption (ABE) is a very important encryption method, which is also known...

AI Technical Summary

Problems solved by technology

The attribute-based encryption scheme makes the access strategy more flexible. Relevant researchers took the advantages of ABE and proposed several ABE-based keyword search schemes, but their performance can still be further optimized.

For example, although the existing scheme can provide a revocation mechanism, it cannot minimize the loss when the key is leaked, and there is additional transmission overhead during the key update process.

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