Abstract
The pandemic of COVID-19 has posed a severe challenge to the traditional on-site centralized development projects; people therefore have to share data in a group by the cloud storage server and develop projects at home. The cloud server is untrustworthy, although it supplies the powerful computing capability and abundant storage space; so far wide research has been proposed to verify data integrity. Therefore, how to leverage the cloud server and ensure the integrity of the data (especially the encrypted data) stored on the remote cloud devices remains an issue for the clients. To address this issue, we utilize the technique of homomorphic hash function to implement reencryption ciphertext blocks and introduce a certificateless signature scheme for the integrity verification of encrypted data shared within a group. A detailed challenge-and-response game represents that the proposed scheme can preserve encrypted data blocks integrity against the internal/external attacker and malicious cloud service servers. We give the theoretical and experimental performance analysis of the scheme and exhibit that the scheme is efficient and practical.
Highlights
To date, cloud storage service has been an efficient paradigm for storing and sharing data information and a cooperation platform for staff to collaborate in many companies
With the travel restrictions caused by the COVID-19 pandemic, people can only stay in their own homes and work through the Internet; thereby the use of cloud services for task cooperation and sharing has become important
To overcome the disadvantages of previous schemes and address the aforementioned issues, we propose a new remote data possession checking scheme for encrypted shared data group. e contributions of the proposed scheme are presented as follows: (i) We propose a new remote data possession checking scheme to audit encrypted shared data in each group, in which the certificateless public key system is utilized as an underlying encryption mechanism, and the homomorphism hash approach is used to regenerate the ciphertext to improve the efficiency of member revocation scheme
Summary
Cloud storage service has been an efficient paradigm for storing and sharing data information and a cooperation platform for staff to collaborate in many companies. With the travel restrictions caused by the COVID-19 pandemic, people can only stay in their own homes and work through the Internet; thereby the use of cloud services for task cooperation and sharing has become important. Dropbox for Business [1], TortoiseSVN [2], and Google Drive already have become cloud service platforms for employees to share and collaborate online. The prerequisite for this type of application to facilitate many company staff to work together is whether the cloud server provider (CSP) can make sure that the data is retained intact. Owing to the existence of these above attacks, the integrity of data is destroyed, which will inevitably reduce the availability and storage significance of data. is paper focuses on the integrity of data stored in the cloud
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