題  目：Blockchain-Based Private Provable Data Possession

内容簡介：Remote data secure storage is of crucial importance in cloud computing. In order to check remote data integrity, an important paradigm PDP ({/it i.e.}, provable data possession) is proposed. All the existing PDP schemes make use of RSA or bilinear pairings. One large file has to be divided into a great many of blocks. For example, 1T (Terabit) file has to be divided into  $1.0737 /times 10^9$ blocks (RSA where the length of the index is 1024 bits) or $6.8719 /times 10^9$ blocks (bilinear pairings where the order of the elliptic curve is 160 bits). The huge computation cost and communication cost incurs the inefficient PDP implementation. In other words, they are not practical. In order to solve the problem, we propose a new PDP model: blockchain-based private PDP. The new concept makes use of blockchain which is the core of cryptocurrency. For the new concept, the paper formalizes its system model and security model. Then, a concrete blockchain-based private PDP scheme is designed by making use of blockchain and RSA. The proposed blockchain-based private PDP scheme is provably secure. At the same time, we also analyze its performance from two parts: theory analysis and implementation prototype. Our analysis shows that the proposed PDP scheme is secure, efficient and practical.

報告人：南京郵電大學  王化群  教授

報告人簡介：博導。江蘇省雙創團隊核心成員、江蘇高校青藍工程-中青年學術帶頭人、“遼甯省百千萬人才工程”百人層次等。中國保密協會隐私保護專委會委員、中國計算機學會區塊鍊專委會委員、中國密碼學會安全協議專委會委員。主要研究方向為應用密碼學、雲計算安全、區塊鍊技術等。獲IET Information Security最優論文獎1次。

時  間：2019年10月14日（周一）上午10：30始

地  點：南海樓124室

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2019年10月10日