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Efficient privacy protecting audit scheme based on chameleon hash function of cloud storage

A technology of privacy protection and auditing scheme, which is applied in the field of cloud storage and information security, can solve problems such as inappropriate integrity auditing, and achieve the effect of solving a large amount of calculation

Inactive Publication Date: 2015-05-06
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not appropriate to have either the cloud server or the data user conduct an integrity audit, as we cannot guarantee that any of them will favor us

Method used

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  • Efficient privacy protecting audit scheme based on chameleon hash function of cloud storage
  • Efficient privacy protecting audit scheme based on chameleon hash function of cloud storage
  • Efficient privacy protecting audit scheme based on chameleon hash function of cloud storage

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Experimental program
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Embodiment 1

[0058] as attached figure 1 As shown, the efficient privacy protection audit scheme based on chameleon hash in the cloud storage of the present invention comprises the following steps:

[0059] (1) System initialization steps:

[0060] Public system parameter Param=(G 1 ,G 2 ,G T ,e,Φ,g 1 , g 2 ,h,Y CA ,h 1 , u 1 ,...,u t );

[0061] (2) Registration steps:

[0062] The data user generates a public-private key pair and registers with the CA, and the CA generates a public key certificate;

[0063] (3) Data users generate pseudo-random key pairs and hash keys;

[0064] (4) Data label generation steps:

[0065] The data user blocks and encrypts the data file, and then uses his own pseudo-random key pair to generate the data label t i , and then label the generated data t i , The encrypted data block is uploaded to the cloud storage server;

[0066] (5) Challenge steps:

[0067] When the data user needs to check the integrity of the data file, the relevant informa...

Embodiment 2

[0073] Such as figure 1 Shown, except following difference, all the other are identical with embodiment 1:

[0074] The calculation method of the hash value H is in the cyclic group G 1 Calculate on

[0075] In step (1), (G 1 ,G 2 ,G T ) is a three-order large prime number p>2 k The multiplicative cyclic group of , where k is a given security parameter, g 1 , g 2 G respectively 1 ,G 2 Generator; bilinear map e:G 1 ×G 2 →G T ;Group G 2 to group G 1 The homomorphism Φ; the collision-free hash function h:{0,1} * →G 1 ; h 1 () is a one-way encrypted hash function; the certificate center CA randomly selects a public-private key pair Select t random numbers x at the same time 1 ,x 2 ,...,x t ∈ Z p ,calculate The data user chooses a secure signature algorithm Sign, and finally discloses the system parameters

[0076] Param=(G 1 ,G 2 ,G T ,e,Φ,g 1 , g 2 ,h,Y CA ,h 1 , u 1 ,...,u t );

[0077] In step (2), the data user randomly selects S ID ∈ Z P...

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Abstract

The invention provides an efficient privacy protecting audit scheme based on the chameleon hash function of cloud storage. The scheme includes (1) a system initialization step; (2) a registration step; (3) a pseudo-random key pair and hash key generation step for data users; (4) a data label generation step; (5) a challenge step; (6) a proof step; (7) a validation step. According to the scheme, on the basis of the decidable Diffie-Hellman problem and a chameleon digital signature, a privacy protecting public audit scheme is established, and high efficiency, low safety assumptions and wide application range are provided; according to a cloud server, the identity privacy of the data users is protected, and the outsourcing data integrity is protected; according to auditors, the data user privacy is protected in the whole auditing process.

Description

technical field [0001] The invention relates to the fields of cloud storage and information security, and is an integrity audit algorithm for cloud outsourced data, which can realize the anonymous protection of cloud user identities. Background technique [0002] With the development of computer technology and the exponential growth of data, the importance of cloud storage services has been highly valued by people. For the new computing model of cloud computing, enterprises or companies can purchase the required computing resources on a pay-per-view basis, which greatly reduces the company's investment. At the same time, cloud computing also provides a convenient channel for individuals or IT companies to access outsourced data at any time and anywhere through a computer network. However, due to some hardware or software reasons, the data stored in the cloud may be lost or damaged, and what's worse, cloud storage servers may not be willing to disclose these erroneous data t...

Claims

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Application Information

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IPC IPC(8): H04L29/06
CPCH04L63/0407H04L63/123
Inventor 张键红甄伟娜董巧翠
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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