Connection keyword authentication searchable encryption method based on national cryptographic algorithm

Abstract

The invention relates to a connection keyword authentication searchable encryption method based on a national cryptographic algorithm. The method comprises the following steps of: (1) initializing analgorithm; (2) generating a public and private key pair; (3) generating an encryption key through key negotiation; (4) encrypting a document; (5) generating a security index; (6) sending a security list to a cloud server; (7) generating a search token; (8) generating search results; (9) comparing the results; (10) circulating; (11) feeding back the search results; and (12) obtaining a plaintext result. Connection keyword search is supported, it is ensured that a security index can only be generated by a data sender, and keyword guessing attacks of the cloud server are resisted. It is ensured that the token is only matched with the security index sent by the data sender, the ciphertext of the data sender is obtained, the method does not involve bilinear pairing operation with large calculation expenditure when the keyword index is generated, and only one-time bilinear pairing operation is needed when the search token is generated.

Description

technical field [0001] The invention relates to a searchable encryption method for connection keyword authentication based on a national secret algorithm, and belongs to the technical field of domestic password keyword encryption methods. Background technique [0002] Since 2020, the novel coronavirus pneumonia has caused more and more companies to shift their working methods to remote work. Remote work requires that enterprise employees can share files and edit documents collaboratively. This function can be realized by cloud storage service providers that support online document editing (such as Dropbox, Tencent Cloud, Google Cloud, etc.). With cloud storage, developers and enterprises can enjoy global highly durable storage services and flexible access mechanisms through the Internet. Any user can upload their work documents to the enterprise's public cloud, and other team members can access the cloud disk to view and edit the documents. Although cloud storage provides ...

AI Technical Summary

Problems solved by technology

However, the public key searchable encryption scheme does not require a private key when generating a secure index, so keyword guessing attacks have a great impact on system security.

In addition, the existing schemes that can resist keyword guessing attacks are rarely able to efficiently support concatenated keyword searches, and often introduce a large number of bilinear pairing operations in the keyword index generation stage, which greatly reduces the search efficiency

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