Abstract
The popularity and widespread use of cloud have brought great convenience for data sharing and collection. Data sharing with a large number of participants must take into account several issues, including data integrity, efficiency, and privacy of data owners. The shared data must be strongly secured from unauthorized accesses. Many encryption mechanisms support fine-grained encryption. The existing mediated Certificate-less Public Key Encryption scheme reduces the management of key, but the method was found to be insecure against partial decryption attack. Although their scheme relies on pairing operations that incur considerably high computational costs. The proposed mediated Certificate-less Public Key Encryption (mCL-PKE) scheme provides its formal security without pairing operations on based access control.
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