Date of Publication :17th February 2024

Abstract: Users greatly benefit from the use of cloud storage services when it comes to data management. One of the numerous security issues it raises, however, is data integrity. A user may hire an auditor to check the data's integrity using public verification methods; however, current public verification systems are susceptible to auditors putting off verifications until the last minute. The majority of public verification techniques also have issues with certificate management as they are built on the PKI. Using blockchain technology, we provide the first certificateless public verification method (CPVPA) to combat auditors who procrastinate. The main concept is to have auditors record each verification result as a transaction on a blockchain. Users may ensure that auditors execute the verifications at the specified time by having them time-stamped when the appropriate transaction is entered into the blockchain; this is necessary due to the time-sensitivity of transactions on the blockchain. In addition, the certificate management problem is not an issue with CPVPA since it is based on certificateless cryptography. We establish that CPVPA is secure by presenting rigorous security proofs, and we show that it is efficient by doing a thorough performance assessment in addition an image or file recovery mechanism is included to improve the cloud storage system's general integrity and reliability

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