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Attribute-based online/offline keyword search method in mobile cloud environment and cloud computing application system thereof

A search method and mobile cloud technology, applied in the field of cloud computing security, can solve the problems of increased computing costs for user encryption and decryption, and increased pairing operations.

Inactive Publication Date: 2018-01-05
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At the same time, with the in-depth research on attribute-based searchable encryption (ABSE), it also has many defects: due to the large number of pairing operations in ABE (the calculation cost of pairing operations is much higher than other operations), pairing operations are random As the number of attributes increases, the computational cost of user encryption and decryption also increases with the increase in the number or complexity of access policy attributes, which is a very serious problem

Method used

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  • Attribute-based online/offline keyword search method in mobile cloud environment and cloud computing application system thereof
  • Attribute-based online/offline keyword search method in mobile cloud environment and cloud computing application system thereof
  • Attribute-based online/offline keyword search method in mobile cloud environment and cloud computing application system thereof

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Embodiment 1

[0085] Such as figure 1 As shown, an attribute-based online / offline keyword search method under a mobile cloud environment of this embodiment includes the following steps:

[0086] Step (1), system initialization, TA generates system public key and master key: TA executes system initialization algorithm, inputs security parameter λ and an attribute set U, selects two p-order cyclic groups G, G T . The system randomly selects g, h, u, v, w∈G and α∈Z p . TA calculates e(g,g) α . Let H:{0,1}→Z p is a secure hash function, F is a message authentication function, generating system public key PP=(G,G T ,p,g,h,u,v,w,e(g,g) α , H, F) and system master key MSK=(α).

[0087] Step (2), offline phase, TA generates intermediate keys offline for newly joined users; the specific implementation process is as follows:

[0088] (2.1) In the offline phase, the offline key generation algorithm first randomly selects r∈Z p . TA calculates K 0 =g α w r , K 1 =g r , K v =v -r , we ...

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Abstract

The invention discloses an attribute-based online / offline keyword search method and its cloud computing application system in a mobile cloud environment, comprising the following steps: system initialization, TA generates a public key and a master key; TA generates an intermediate key offline for a new user After the new user completes the registration, TA generates its attribute private key; TA generates an outsourced key for the new user; the data master encrypts the information offline on the mobile device side to obtain the intermediate ciphertext;) the data master encrypts the intermediate ciphertext online to obtain the complete ciphertext The data master generates an index set, and the user uses its own attributes to generate relevant trapdoors, and sends them to the cloud server together; the cloud server receives the encrypted index and trapdoor, and searches for keywords; the user decrypts to obtain the target information. The present invention realizes searchable encryption based on an attribute encryption mechanism and online / offline technology, protects user privacy, and greatly reduces user expenses.

Description

technical field [0001] The invention relates to a cloud computing security technology, in particular to an attribute-based online / offline keyword search method and a cloud computing application system in a mobile cloud environment. Background technique [0002] At present, cloud computing is considered as an efficient data computing method, which can provide storage and computing functions to the public through the Internet. In this method of computing, data owners often send their messages to cloud servers. In addition to bringing computing advantages to the cloud, outsourcing data to the cloud may also cause some privacy issues, because the outsourced data contains some sensitive information. Encryption before outsourcing has been seen as a fundamental approach to data privacy on cloud servers. However, how to make these encrypted data be used efficiently has become another challenge. Therefore, we pay more attention to this problem, and theoretically provide solutions ...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L9/08H04L9/06
Inventor 崔杰周罕仲红许艳石润华陈志立
Owner ANHUI UNIVERSITY
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