Security Mechanism for Group Communication in Cloud

Cloud computing provides an economical and efficient solution for sharing group resource among the cloud users. Sharing data in a multi-owner manner while preserving data and identity privacy from an un-trusted cloud is still a challenging issue, due to the frequent change of the members. Mona is a secure Multi-Owner data sharing scheme which leverages the group signature and dynamic broadcast encryption technique. Even though Mona is considered to be secure, if a new user joins the group, he can access any data present before he joined the group. If any user leaves the group, the user may share or sell the data. In this paper a new technique is proposed in which the whole file will be encrypted by the admin and passed to the specified authorized users along with key to decrypt the file and the key will be based on one time password technique which provides more security for group communication.