Media sharing is an extremely popular paradigm of social interaction in online social networks (OSNs) nowadays. The scalable media access control is essential to perform information sharing among users with various access privileges. In this paper, we present a multi-dimensional scalable media access control (MD-SMAC) system based on the proposed scalable ciphertext policy attribute-based encryption (SCP-ABE) algorithm. In the proposed MD-SMAC system, fine-grained access control can be performed on the media contents encoded in a multi-dimensional scalable manner based on data consumers' diverse attributes. Through security analysis, we show that the proposed MC-SMAC system is able to resist collusion attacks. Additionally, we conduct experiments to evaluate the efficiency performance of the proposed system, especially on mobile devices.
Unfortunately, such method may result in user collusion when the media layers are organized following the multi-dimensional scalable format. That is two users may collude with each other to generate a valid but illegal access key for unauthorized higher level access. The resistance of such collusion attack requires increasing the number of key segments. From the results shown in @cite_9 , the best performance of a collusion secure scheme needs @math key segments under a @math -by- @math -by- @math ( @math ) data structure, but at the same time results in @math more hash calculations. As a result, the communication cost saved by segmenting access keys is less significant, while the resulted computation cost is more than expected. Therefore, the aim to reduce the cost of key distribution is not sufficiently meaningful.
@cite_9
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This paper proposes a novel key management scheme for multi-dimensional scalable multimedia access control. We build up a collusion-attack model and prove that the proposed scheme is indeed resilient to collusion attack. The lower bound of number of the segment keys is also given in the analysis. We consider the key management problem on partially order set and propose a general approach consists of a poset decomposition step and an element projection step. Under the proposed framework, a novel hierarchical 3D poset decomposition approach is further developed. The proposed scheme is the first provable collusion resilient scheme in 3-dimension (and higher) scenario. It can be easily adapted to other scalable dependence structure and higher dimension. Analysis on the proposed scheme proves its collusion-resilient property.