期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2015
卷号：28
期号：2
页码：104-106
DOI：10.14445/22312803/IJCTT-V28P118
出版社：Seventh Sense Research Group
摘要：cloud offers scalable, secure and reliable data storage, sharing service and modify data as a group. Different user in the group needs to sign their modified blocks in order to ensure data integrity. Resigning mechanism is performed by existing user whenever a user revocated from a group, due to reliability issues. During user revocation, it is difficult for an existing user to download and resign the corresponding part of shared data in the cloud. In our project is a new proxy resignature method, which satisfies the property of block less verifiability and nonmalleability. Based on the new proxy resignature scheme we present PAACC public auditing and revocation with automatic signature computation in the cloud. In our mechanism, the original user acts as the group manager, who is able to revoke users from the group when it is necessary. Here cloud act as a semitrusted proxy and with resigning keys it converts signatures for users in the group. In our mechanism, we assume the cloud has servers to store shared data and to manage resigning keys.
