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The outsourcing of data into the cloud inherently requires a mechanism to control the access capability of the users and the cloud providers. This mechanism requires efficient cryptographic primitives to achieve fine grained access control of data, proof of storage, and revocation of the authorization. In this paper, we present a secure cloud data storage(More)
In this paper, we present a novel concept in proxy signature by introducing a trusted proxy agent called mediator together with a proxy signer, which enables an efficient revocation of signing capability within the delegation period, by controlling the signing capability of proxy signer even before/after generating the signature by the designated proxy(More)
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