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Recent trend towards cloud computing paradigm, smart devices and 4G wirelesstechnologies has enabled seamless data sharing among users. Cloud computingenvironment is distributed and untrusted, hence data owners have to encrypttheir data to enforce data confidentiality. The data confidentiality in adistributed environment can be achieved by using attribute-based encryptiontechnique. Decentralized attribute-based encryption technique is a variant ofmultiple authority based attribute-based encryption whereby any attributeauthority can independently join and leave the system without collaboratingwith the existing attribute authorities. In this paper, we propose aprivacy-preserving decentralized key-policy attribute-based encryption scheme.The scheme preserves the user privacy when users interact with multipleauthorities to obtain decryption keys while mitigating the well-known usercollusion security vulnerability. We showed that our scheme relies ondecisional bilinear Diffie-Hellman standard complexity assumption in contrastto the previous nonstandard complexity assumptions such as $q-$decisionalDiffie-Hellman inversion.

User Collusion Avoidance Scheme for Privacy-Preserving Decentralized Key-Policy Attribute-Based Encryption -- Full Version