Ciphertext cloud-storage oriented document retrieval method and system

Abstract

The invention discloses a ciphertext cloud-storage oriented document retrieval method and a ciphertext cloud-storage oriented document retrieval system, belonging to the technical field of information security. The method comprises the following steps: 1) a client generates an index key for a user by a master key imported by the user, and encrypts the index key by the master key, then stores the index key into a server; 2) after receiving the attribute metainformation of a document to be inquired input by a certain user, the client acquires a ciphertext of the index key from the server, then decrypts the ciphertext so as to obtain a decrypted index key; 3) the client encrypts the attribute metainformation of the document to be inquired by the decrypted index key, then sends the encrypted attribute metainformation to the server; and 4) the server carries out ciphertext retrieval on the index table according to the attribute metainformation, returning the retrieval records meeting the conditions to the client so as to obtain documents corresponding to the attribute metainformation. The system comprises a server and a plurality of clients, and the clients are respectively connected with the server through the Internet. The method and the system disclosed in the invention have the advantages that the security and retrieval efficiency of the ciphertext retrieval system are improved, and the expansibility is high.

Description

technical field [0001] The invention relates to the field of computer software, in particular to a document retrieval method and system for ciphertext cloud storage. It belongs to the field of information security technology. Background technique [0002] With the rapid development of cloud computing technology in recent years, a number of cloud storage systems represented by Amazon S3 have emerged. These cloud storage systems have the characteristics of elastic scalability, and charge according to the specific usage, users can obtain the huge storage space they need in a very short period of time. By using the cloud storage system, users can access data anytime and anywhere, and the operation is more convenient; enterprises also avoid the cost of data center construction and maintenance, which is generally more economical and cheap. It can be expected that in the future, cloud storage will be more widely used, and more and more users and enterprises will choose to use clo...

AI Technical Summary

Problems solved by technology

However, when the document is in the encrypted state, the server has no way to obtain the name, keywords and other information of the document, and the storage system cannot retrieve the document for the user. The user needs to download and decrypt all encrypted documents first, and then judge whether they meet the retrieval conditions. In terms of retrieval time and network transmission bandwidth, the cost is unbearable for users

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