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An Encryption Method of Multiple Authorization Centers

An encryption method and authorizer's technology, applied in the field of information security, can solve the problems of communication cost reduction, calculation cost reduction in decryption stage, etc.

Inactive Publication Date: 2017-02-08
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, since the ciphertext length is fixed, the communication cost will be greatly reduced
On the other hand, since the number of pair operations in the decryption stage is fixed, the computational cost of the decryption stage will be greatly reduced

Method used

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  • An Encryption Method of Multiple Authorization Centers
  • An Encryption Method of Multiple Authorization Centers
  • An Encryption Method of Multiple Authorization Centers

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Embodiment Construction

[0045] The following describes in detail a multi-authorization center encryption method proposed by the present invention with reference to the accompanying drawings: the mathematical theory used in the present invention:

[0046] 1. Bilinear Pairing

[0047] Here is a brief introduction to the basic definition of bilinear mapping and the properties it needs to satisfy.

[0048] Let G 0 ,G 1 Are two multiplicative cyclic groups of order p, where p is a prime number and g is G 0 Generator. Define the bilinear mapping on the two groups as: e:G 0 ×G 0 →G 1 , And satisfy the following properties:

[0049] (1) Double mapping: e(g a ,h b )=e(g,h) ab For all Are all established.

[0050] (2) Non-degeneration: e(g,g)≠1.

[0051] (3) Computability: There are effective algorithms to calculate e.

[0052] 2. Assumption of difficult problem in determining BDH (Decisional Bilinear Diffie-Hellman)

[0053] Given p-order cyclic group G 0 , Where p is a prime number and g is G 0 Generator. Group G 0 T...

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Abstract

The invention provides an encryption method for multiple authorization centers. The method includes the steps that system parameters are firstly set; a public key and private keys of an authorizer are set according to the system parameters, the public key is used for encrypting data, and the private keys are used for generating a private key of a user; the private key of the user is used for decrypting an encrypted message. Through the encryption method which fixes the length of the encrypted message, includes the multiple authorization centers and is based on attributes, a center authorizer is removed, each authorization center independently manages the attribute and distributes the private keys, meanwhile, calculation cost and communication cost of the authorization centers and the user are reduced through the method, the encryption method is used for solving problems of access control and safety in cloud calculation, the efficiency of system operation is improved, and expenditure is saved.

Description

Technical field [0001] The present invention belongs to the field of information security technology, and specifically refers to a multi-authorization center encryption method. Background technique [0002] With the development of information technology, more and more sensitive data is stored on third-party sites and shared among Internet users. Since third parties may not be completely trusted, it is necessary to store these data in encrypted form. The attribute-based encrypted ABE system has received more and more attention due to its special application significance and wide use scenarios. Attribute-based encryption was first proposed by Sahai and Waters in 2005. This system can be seen as a generalization of identity-based encryption. The user's identity in the system is no longer single, but is described by a descriptive attribute set. The encryption and decryption processes are all related to the access structure. Essentially, the attribute-based encryption system integr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/30
Inventor 李继国钱慧玲张亦辰滕美林
Owner HOHAI UNIV