Leakage Resilient Provable Data Possession in Public Cloud Storage

Cloud storage is now an important development trend in information technology. To ensure the integrity of data storage in cloud storing, researchers have present some provable data possession (PDP) schemes. However the schemes can´t resist side-channel attacks. Moreover securing cryptographic implementations against side-channel attacks is one of the most important challenges in modern cryptography. In this paper, we propose the first leakage-resilient provable data possession (LR PDP) scheme, which utilizes leakage-resilient signature to construct the homomorphic authenticator. In the scheme, the homomorphic authenticator is based on probabilistic Boneh-Lynn-Shacham(BLS) short signature. Moreover, the leakage-resilient provable data possession can tolerate leakage of (1-O(1)/2) of the secret key at every tag invocation. And the security of the proposed scheme is proved in the generic bilinear group model.