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Mobile Social Network (MSN) is a promising networking and communication platform for users having similar interests (or attributes) to connect and interact with one another. For many recently introduced secure MSN data communication schemes, attribute-based encryption is often adopted to preserve user privacy. These schemes are mainly to prevent outside attackers from eavesdropping. In this paper, the authors propose an efficient and secure user revocation scheme in accordance with an attribute-based encryption technique. This novel scheme enables a Trusted Authority (TA) to flexibly control the data decryption capability of mobile social users. It disables malicious users from decrypting any data packet.
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