ACHIEVING SECURE ANTI - COLLUSION FOR SHARING OF DATA BETWEEN DYNAMIC GROUPS IN THE CLOUD
International Journal of Computer Science (IJCS) Published by SK Research Group of Companies (SKRGC)
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Cloud computing give more benefits to user for achieving very efficient and cost effective approach to share data between members of group which is created in cloud with very cost effective maintenance and management. In added benefit with this efficient data sharing, it also provides security for data files, because they are outsourced. But the process of preserving security is little bit complicated because of adequate change of members of group and it may lead to collusion attack. The existing systems provide security over communication channel is practically difficult to implement. In this paper, a secure data sharing method for dynamic members is proposed and implement in 4 phases. In first phase, a secure way for key distribution without any secure communication channel is proposed and the members of the group can securely preserve their private keys from group admin. In second phase, our proposed scheme achieves a well-structured access control tool, which protects the cloud by denying the access for the revoked user. In third phase, we achieve a scheme to prevent collusion attack. In this scheme the revoked user cannot get the original data file. In final phase, fine efficiency would be accomplished by preserving the private keys of previous user, which means that there is no need to change their private keys in any scenarios like addition of new user in group and removal of existing user from group.
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Private key, cloud security, privacy preserving, key distribution.