In the cloud storage environment

the multiple copies are more popular. However

aiming at the problems of data dynamic operation and malicious cloud service provider attacks encountered in multi-copy data integrity audit

a multi-copy integrity audit scheme based on dynamic divide and conquer table (DDCT) is proposed. Firstly

the dynamic divide and conquer table is introduced to solve the problem of dynamic data operation

and the block number

version number and timestamp of the copy data are stored in the table. In order to resist the malicious cloud service provider attacks

a time-based replica data signature authentication algorithm is designed. Secondly

it proposes the concept of replica block including block header and block body. The block header stores the authenticated signature information which is based on timestamp

and the block body stores the encrypted data. Finally

the third-party auditing agency uses a replica timestamp-based signature authentication algorithm to audit the integrity of the multi-copy data. Through security analysis and experimental comparison

this solution protects data information from third-party auditors while effectively preventing malicious cloud service provider attacks.