Cloud computing is an emerging computing paradigm in which resources of the computing infrastructure are provided as services over the internet. It provides an economical and efficient solution for sharing group resource among cloud users. Data sharing in a multi-owner manner while preserving data and identity privacy from an untrusted cloud is still a challenging issue because of dynamic nature of multi-owner group. The solution of this issue is addressed in recently best efficient scheme MONA: secure multi-owner data sharing for dynamic groups in the cloud but it has some limitations. In this paper we are further extending the basic MONA by adding the reliability by increasing the number of group managers dynamically and also we are using efficient revocation for dynamic groups by leveraging group signature and dynamic broadcast encryption techniques and for overall security HMAC_SHA1 algorithm. Meanwhile, the storage overhead and encryption computation cost are independent with the number of revoked users.
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