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Multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage

A technology of bilinear pairing and encryption method, which is applied in the field of information security and can solve the problem that keyword retrieval cannot be realized.

Active Publication Date: 2018-05-29
WUHAN FIBERHOME INFORMATION INTEGRATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage, which solves the problem that keyword retrieval cannot be realized after cloud storage data encryption in the prior art

Method used

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  • Multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage
  • Multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage
  • Multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage

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Embodiment Construction

[0051] The present invention will be described in detail below in combination with specific embodiments.

[0052] The multi-user multi-keyword searchable encryption method based on bilinear pairing in the cloud storage of the present invention is specifically implemented according to the following steps:

[0053] Step 1. System parameter initialization:

[0054] Specifically follow the steps below to implement:

[0055] Step (1.1), the security parameter k is input by the file encryptor Ent, and two multiplicative cyclic groups G whose order is a prime number q are output 1 and G 2 , g 1 for G 1 generator, g 2 for G 2 generator of

[0056] Step (1.2), select a bilinear map

[0057] Step (1.3), randomly and uniformly select x∈Z q As the master key of the file encryptor Ent, denoted as in Calculate h=g 1 x ∈G 1 ;

[0058] Step (1.4), choose two pseudo-random functions and Randomly choose two random seeds s′,s″∈ R {0,1} k ;

[0059] Step (1.5), select sy...

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Abstract

The invention discloses a bilinear pairing-based multi-user multi-keyword searchable encryption method in cloud storage. The specific steps include: 1. initialization of system parameters; 2. addition of users; 3. file encryption by a file owner and generation of a safe index; 4. index re-encryption by a server; 5. generation of a keyword search token by the users; 6. search of ciphertext keywords by a cloud storage server; 7. decryption of ciphertext by the users; and 8. cancellation of the users. The bilinear pairing-based multi-user multi-keyword searchable encryption method provided by the invention solves the problem existing in the prior art that keyword search cannot be realized after cloud storage data are encrypted.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a multi-user and multi-keyword searchable encryption method based on bilinear pairing in cloud storage. Background technique [0002] As a new computing model, cloud computing can provide various advanced computing services with low cost and scalability. In order to save the cost of storing and managing data, enterprises and individuals can outsource data to cloud storage servers. The data provided by the cloud storage service has the advantages of availability and reliability, but it also has an obvious disadvantage, that is, the data is not under the management and control of the user, so how to maintain the confidentiality and integrity of the data becomes an urgent concern of the user. question. [0003] Although enterprises believe in the reliability, availability, fault tolerance, etc. of Cloud Storage Service Provider (CSSP), people cannot be sure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L29/06G06F17/30
Inventor 王尚平张亚玲
Owner WUHAN FIBERHOME INFORMATION INTEGRATION TECH CO LTD
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