Efficient Publicly Verifiable Proofs of Data Replication and Retrievability Applicable for Cloud Storage
Clémentine Gritti, Hao Li · Advances in Science Technology and Engineering Systems Journal · 2022
Using Proofs of Retrievability (PORs), a file owner is able to check that a cloud server correctly stores her files.Using Proofs of Retrievability and Reliability (PORRs), she can even verify at the same time that the cloud server correctly stores both her original files and their replicas.In 2020, a new PORR combined with Verifiable Delay Functions (VDFs) was presented by Gritti.VDFs are special functions whose evaluation is slow while verification is fast.Therefore, those functions help guarantee that the original files and their replicas are stored at rest.Moreover, an important feature of the 2020 PORR solution is that anyone can verify the cloud provider's behaviour, not only the file owner.This paper extends Gritti's version.In particular, a realistic cloud framework is defined in order to implement and evaluate accurately.Results show that this PORR solution is well suitable for services provided for cloud storage.