Certificateless verifiable multi-keyword ciphertext inquiring system and method

Abstract

The invention discloses a certificateless verifiable multi-keyword ciphertext inquiring system and method. The system mainly comprises three modules: a key generation module, a ciphertext inquiring module and a verifiable module; under the cloud storage background, the system supports multi-keyword ciphertext retrieval by using the searchable encryption technology, and quickly positions to the interested ciphertext document of the user; the system solves the problems of certificate management and private key collocation by using the certificateless encryption technology, and performs correctness verification on an inquiring result by using public auditing technology, thereby guaranteeing the data integrity. By using the certificateless encryption technology, the system disclosed by the invention enables a key generation center to generate partial private key according to data user identity information, the data user generates the complete private key according to the partial private key and a secret value; the key generation center cannot obtain the data user private key; the certificate management expenditure is avoided, and the private key collocation problem is solved.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to certificate-free encryption technology, public audit technology and ciphertext retrieval technology, and in particular to a certificate-free verifiable multi-keyword ciphertext query system and method, which can be used for designing in the background of cloud storage Realize certificate-free verifiable multi-keyword ciphertext query. Background technique [0002] Due to its convenient storage services and flexible charging methods, cloud computing enables more and more enterprises and individuals to store local data on cloud servers to reduce the storage burden and management overhead of local data. However, the plaintext data stored on the cloud server is out of the direct physical control of the data owner, which may be subject to malicious attacks and pose serious security risks. Although the method of encrypting the data with a cryptographic algorithm before outs...

AI Technical Summary

Problems solved by technology

But in reality, cloud servers are sometimes untrustworthy. When data users search for ciphertext keywords, untrustworthy cloud servers may perform some operations in order to save computing and bandwidth resources and return some wrong search results.

Images