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Multi-user file sharing control method in cloud environment

A file sharing and control method technology, applied in electrical components, digital transmission systems, secure communication devices, etc., can solve problems such as high computational cost and inability to resist quantum computing attacks, achieve good security, reduce computational complexity, and resist quantum computing. effect of attack

Active Publication Date: 2017-06-13
深圳市嘉鸿网络科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Elgamal encryption algorithm and the RSA encryption algorithm mainly use the modular exponentiation operation of the finite field, which has high calculation costs and cannot resist quantum computing attacks.

Method used

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  • Multi-user file sharing control method in cloud environment
  • Multi-user file sharing control method in cloud environment
  • Multi-user file sharing control method in cloud environment

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Experimental program
Comparison scheme
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Embodiment

[0061] Based on NTRU (Number Theory Research Unit) public key encryption algorithm and proxy re-encryption technology, the invention proposes an efficient and safe multi-user shared file control method.

[0062] It is known to use Z to represent the integer ring, and use Z[X] to represent the convolution polynomial ring on Z, and the N degree convolution polynomial ring can be expressed as R=Z[X] / (X N -1), the N-degree convolutional polynomial ring modulo q can be expressed as R q = Z q [X] / (X N -1).

[0063] In the NTRU algorithm, D f 、D g is the private key space, respectively representing a set of polynomials, and the private key is selected from these two sets of polynomials. D. r Is the dazzling value space, which is a polynomial set, and the temporary dazzling value is selected from the set when the NTRU algorithm is encrypted.

[0064] The NTRU algorithm runs in a polynomial ring R=Z[X] / (X N -1), the degree of all polynomials is equal to N-1, and the coefficient...

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Abstract

The invention discloses a multi-user file sharing control method in a cloud environment. The method utilizes an NTRU algorithm and a proxy re-encryption technology, proposes an efficient and safe multi-user shared file control scheme, and implements more fine-grained delegate control of a file owner on a shared file. The method mainly comprises parts of key generation, encryption, proxy re-encryption and decryption. When a ciphertext storage space is reduced, the method only needs to carry out addition, subtraction, multiplication and modular operations, calculated quantities of file encryption and decryption are only in linear increasing relationship with a multiplication operation of a number of file blocks, and after the file owner authorizes, file sharing users can access respective different file block contents. The multi-user file sharing control method disclosed by the invention has the advantages of resistance to a quantum calculation attack, low calculation cost and low communication traffic, and is more suitable for an environment in which client calculation resources and communication resources are limited.

Description

technical field [0001] The invention specifically relates to a multi-user file sharing control method in a cloud environment. Background technique [0002] Cloud storage service has been recognized by the IT industry as the most promising data storage method. Users in various fields can store massive amounts of data in cloud servers, and allow other legitimate users to share these data, allowing these data to generate larger data. application value. For example, in the medical system, storing the patient's electronic medical record in the cloud server and providing online medical record retrieval and calling can not only reduce the patient's medical examination cost, but also help other doctors choose a better medical plan. Table 1 is a simplified electronic case information form of a medical unit. The content of the table includes basic personal information (name, gender, age), disease statement, medical examination data, diagnosis results, and treatment, with a total of 7...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L29/08H04L9/08
CPCH04L9/0861H04L63/04H04L63/10H04L67/06H04L67/10
Inventor 步山岳冯万利陈礼清刘海荣
Owner 深圳市嘉鸿网络科技有限公司
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