Dynamic verification method of cloud storage data using lattice-based linearly homomorphic signatures

A dynamic verification and cloud storage technology, applied in user identity/authority verification, homomorphic encryption communication, digital transmission system, etc., can solve problems such as not supporting dynamic data verification

Active Publication Date: 2017-01-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution does not support dynamic data verification. In cloud storage verification, since files or data are often inserted, modified or deleted, dynamic data verification is particularly important.

Method used

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  • Dynamic verification method of cloud storage data using lattice-based linearly homomorphic signatures
  • Dynamic verification method of cloud storage data using lattice-based linearly homomorphic signatures
  • Dynamic verification method of cloud storage data using lattice-based linearly homomorphic signatures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Such as figure 2 As shown, the dynamic verification method of cloud storage data based on lattice-based linear homomorphic signature includes data integrity verification, and the data integrity verification includes:

[0058] S01. Key generation: use the trapdoor base generation algorithm on the lattice to generate the public key and private key of the linear homomorphic signature algorithm on the lattice.

[0059] The keys are generated in the following way:

[0060] (pk,sk)←TrapGen(1 n )

[0061] p k = A ∈ Z q n * m , s k = T ∈ Z q m * m

[0062] In the formula, TrqpGen(1 n ) is the trapdoor base generation algorithm on the lattice, pk is the public key, sk is the private key, It is a group composed of m*m integer matrices in base q. Mat...

Embodiment 2

[0086] On the basis of Embodiment 1, in this embodiment, the dynamic verification method also includes modifying data: M represents the request information for data modification, and the user wants to change the data block u i change into As an example, the user will modify the data block Use the lattice-based linear homomorphic signature algorithm to find the corresponding signature order update information and will update the information sent to the cloud server;

[0087] The cloud server executes the polynomial time algorithm ExeUpdate(F,Φ,Update), and the cloud server modifies the data block according to The subscript i of the data block u to be modified i Replace with Modified Data Block signature e i replace with get file signature collection According to the signature set Φ * Calculate the value of the new root node Such as image 3 As shown, the cloud server will prove Sent to user ;P Update It is the proof of whether the data sent by the clo...

Embodiment 3

[0091] On the basis of Embodiment 1, in this embodiment, the dynamic verification method also includes modifying data: I represents the request information for data insertion, so that the user can add data block u after the i-th data block *' as an example.

[0092] The dynamic verification method also includes inserting data: the user uses a lattice-based linear homomorphic signature algorithm to obtain the inserted data block u *' signature e *' , and update information Update={I,i,u *' ,e *'} to the cloud server;

[0093] The cloud server executes the polynomial time algorithm ExeUpdate(F,Φ,Update), and inserts the data block u *' Stored in the cloud server, the signature e *' put in signature e i After that, get the file signature collection Calculate the value of the new root node (Such as Figure 4 shown); the cloud server will sent to the user;

[0094] User according to (Ω i ,e i ) Find the value h″ of the root node of the Merkle hash tree R , judge ...

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PUM

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Abstract

The invention discloses a dynamic verification method of cloud storage data using lattice-based linearly homomorphic signatures. The method comprises data integrity verification including: a public key and a private key of a linearly homomorphic signature algorithm on a lattice are generated, a file is divided into a plurality of data blocks, each data block is signed, the value of a root node is calculated on the basis of a Merkle hash tree, the value of the root node is signed, and the data blocks, signatures of the data blocks and a signature of the root node are sent to a cloud server; IDs of the public key and the file are provided for a third-party audit, which initiates a challenge to the cloud server to verify whether the data blocks changed or not; the cloud server provides corresponding proof for the challenge initiated by the third-party audit; and the third-party audit judges whether the data blocks are complete according to the proof provided by the cloud server and feeds a verification result to a user. The method can resist quantum attacks initiated by quantum computers in the future and support cloud dynamic operation verification while protecting user private information.

Description

technical field [0001] The invention relates to the field of encryption technology, in particular to a dynamic verification method for cloud storage data using a lattice-based linear homomorphic signature. Background technique [0002] Cloud storage is a basic service of cloud computing. Cloud storage providers provide users with a large amount of storage space, and users can access cloud data anytime and anywhere. While providing convenience for users, it also brings new security risks. After the user uploads the local data to the cloud server, he loses direct control over the data. Malicious cloud service providers may spy on or tamper with the user's data out of curiosity or other unknown purposes. Therefore, the integrity and availability of cloud data become Problems to be solved. Cloud authentication protocols based on traditional cryptographic schemes generally specify the intractability of a difficult problem, for example, authentication protocols based on the RSA s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32H04L9/08H04L9/00
CPCH04L9/002H04L9/008H04L9/0852H04L9/0894H04L9/3236H04L9/3247
Inventor 王玉秀文红廖力
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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