PSDP: Blockchain-Based Computationally Efficient Provably Secure Data Possession

Provable Data Possession is a protocol that helps the client to verify the integrity of the data that has been stored in cloud or a remote server. It allows the client to verify that the data possessed by the server is not modified, damaged or lost i.e. the data is original in all forms without retrieving it. Probabilistic proof of possession are constructed by the model by performing random sampling to choose random blocks of data from the remote server. To verify this, client maintains a data of fixed volume. This reduces the input and output costs drastically. We have constructed an efficient and lightweight provably secure Data Possession (PSDP) using Elliptic Curve Digital Signature Algorithm (ECDSA) in the signing process in this paper.