期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
期号：ICETET
页码：175
出版社：S&S Publications
摘要：Data sharing is an important functionality in cloud storage. In this previous work, we show how tosecurely, efficiently, and flexibly share data with others in cloud storage. The existing work presents the Key-Aggregate Cryptosystem used for conveniently sent to others or be stored in a smart card with very limited securestorage. A limitation of existing work is the predefined bound of the number of maximum ciphertext classes and key isprompt to leakage. Our proposed work mainly concentrates on above two problems. Our first work dynamically reservenumber of maximum ciphertext classes in cloud storage. In case of Stream cipher the number of classes decideddynamically, because the cipher text size is too larger than block cipher. The number of classes required at dynamicallyis decided based in the prediction of previous delay of cipher sequences. Key stream depend only on the previouscipher texts and keys. This is asynchronous stream cipher whose ith key is the function of n previous cipher texts.Additionally designing a Leakage-Resilient Identity-Based Encryption (LR-IBE) allows efficient and flexible keydelegation. LR-IBE system is selectively secure under the simple Decisional Bilinear Diffie-Hellman assumption(DBDH), and serves as a stepping stone to our second fully secure construction. Our scheme gives an efficient keyencryption scheme for efficient and flexible.
关键词：cloud storage; data sharing; asymmetric encryption; key- aggregate cryptosystem.
