Time-Domain Attribute-Based Access Control for Cloud-Based Video Content Sharing: A Cryptographic Approach


With the ever-increasing demands on multimedia applications, cloud computing, thanks to its economical but powerful resources, is changing into a natural platform to process, store, and share multimedia contents. But, the utilization of cloud computing also brings new security and privacy issues as few public cloud servers will be totally trusted by users. In this paper, we concentrate on how to securely share video contents to a bound cluster of folks during a particular time amount in cloud-primarily based multimedia systems, and propose a cryptographic approach, a provably secure time-domain attribute-primarily based access control (TAAC) scheme, to secure the cloud-based video content sharing. Specifically, we have a tendency to initial propose a provably secure time-domain attribute-primarily based encryption theme by embedding the time into both the ciphertexts and also the keys, such that solely users who hold sufficient attributes during a specific time slot can decrypt the video contents. We tend to additionally propose an efficient attribute updating technique to attain the dynamic modification of users’ attributes, together with granting new attributes, revoking previous attributes, and regranting previously revoked attributes. We have a tendency to additional discuss on how to control those video contents that may be commonly accessed in multiple time slots and how to make special queries on video contents generated in previous time slots. The security analysis and performance analysis show that TAAC is provably secure in generic cluster model and economical in practice.

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