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
卷号：4
期号：3
页码：1446
DOI：10.15680/IJIRSET.2015.0403090
出版社：S&S Publications
摘要：Emerging new computing technology cloud offers storage services. Data sharing with others in secureand efficient manner is important function in cloud storage. For this the new expandable public-key cryptosystemswhich derives fixed-size ciphertexts. Using expandable public-key cryptosystems transform the multiple keys of theclasses as single secret key. The generated single secret key sent to others or be stored in a smart card with very limitedsecure storage. If a user needs to classify his ciphertexts into more than n classes, user can register for additional keypairs. Each class is indexed by a two-level index and the number of classes is increased by n for each added key. Forthe approach, at most two aggregate keys are needed. This key extension approach can also be seen as a key updateprocess. In case a secret value is compromised, user can replace compromised publickey with new publickey.Eventually the approach is flexible and effective.
关键词：Aggregate Keys; ciphertext; Public Key Cryptosystem
