基于无证书的多服务器高效数据审计方案OA

In traditional cloud storage auditing schemes,data integrity verification on cloud servers is typically performed and audited by data owners.However,in practical applications,data users(DU)al-so need to conduct audits to ensure the integrity and correctness of the data they obtain.To this end,a certificateless multi-server efficient data auditing scheme is proposed.In the key generation phase,cer-tificateless cryptography is employed,where user public and private keys are jointly generated by the key generation center(KGC)and the user,effectively avoiding the key escrow problem.In the data up-load phase,the data owner divides the original file into blocks of a certain bit size and blinds each data block using a pseudorandom function(PRF),facilitating the extraction of partial data blocks for auditing while protecting the privacy of the original data from being disclosed.In the audit phase,a third-party auditor(TPA)issues challenges to the cloud servers on behalf of the user.The cloud servers compute proofs based on the challenge information and return them to the third-party auditor.When the proofs returned by the multiple servers are consistent with the information held by the third-party auditor,it indicates that the data audited by the data user possesses integrity and correctness.Security analysis demonstrates that the proposed scheme can effectively resist adversaries'forgery attacks.Performance analysis shows that,compared with existing certificateless auditing schemes,the proposed scheme re-duces time overhead by approximately 30%.