Research Of Attribute-Based Public Encryption With Keyword Search

The scheme of Public encryption with keyword search(PEKS)achieved that users can search what he wants in encrypted data under the condition that it can insure users' data securely.In the cloud computing environment of sharing big data,more and more are data or applications are hoped to be shared to public,but existing PEKS schemes have a weakness that the users must search the keyword only in the way of which the relationship between inquirers and cipher with keyword is one to one.So in these existing schemes cipher with keyword was not suited for searching by more inquirers and these schemes were proved securely in the random oracle model,it may be insecure in reality.In the existing public encryption with keyword search schemes,they need secure channel and they can't realize that many persons can query one ciphertext with keywords.In this paper,we constructs a more efficient attribute-based public encryption with keyword search scheme.Concrete results are as follows:Firstly,we realize that many persons can query one ciphertext with keywords by using attribute-based encryption.it solves the secure of data sharing in the cloud computing.Secondly,we don't need secure channel in the transmission of trapdoor which can be conveyed securely by using the designated tester 's public/private key pair.So it saves resource and improves efficiency.Thirdly,we improve the secure model and the scheme is proved to be secure in the standard model.It overcomes the drawback of using the random oracle model for proving the security of a scheme.