A public key encryption method supporting multi-keyword search against keyword guess attack

Abstract

The invention discloses a public key encryption method for supporting multi-keyword search to resist the attack of keyword guess. The method comprises the following steps: a data owner and a data receiver are registered as a legal authorized user in a trusted third party; the trusted third party runs the global parameter generation algorithm, outputs the global parameter set and sends it to the cloud server, the authorized data owner and the authorized data receiver. The data owner receives the global parameter set and sends the encrypted document set and the keyword ciphertext to the cloud server. The data receiver receives the global parameter set, constructs the keyword trap according to the query sentence, and sends the keyword trap to the cloud server. The cloud server receives the global parameter set, encrypts the ciphertext document, the keyword ciphertext and the keyword trap, and returns the satisfied ciphertext document to the authorized data recipient by running the test algorithm verification. The invention effectively solves the problem of keyword guess attack, realizes keyword search, and has obvious advantages in computational efficiency and communication cost.

Description

technical field [0001] The invention relates to cloud computing security technology, in particular to a public key encryption method supporting multi-keyword search and anti-keyword guessing attack. Background technique [0002] With the rapid development of cloud storage technology, more and more enterprises and individuals choose to store and share data in the cloud. However, due to the separation of cloud data usage rights and management rights, data owners usually encrypt sensitive data to ensure their security in the cloud. Security, which results in the loss of semantic and statistical characteristics of data that can be retrieved, resulting in the inability of cloud service providers to provide users with data search services, which greatly reduces the efficiency of cloud data sharing. [0003] The emergence of public key encryption with keyword search (PEKS, public key encryption with keyword search) provides a solution to the above problems. This technology enables ...

AI Technical Summary

Problems solved by technology

However, there is a lack of methods for online keyword guessing attacks against secure channel free public key encryption with keyword search (SCF-PEKS, secure channel free public key encryption with keyword search) schemes

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