A simplified deniable authentication scheme in cloudâ€based payâ€TV system with privacy protection

摘要

Cloud computing is a milestones for computing model, which enables on-demand, flexible, and low-cost usage of computing resources, especially for cloud storage. Nowadays, the services of cloud-based pay-TV systems are emerging endlessly. But these pay-TV systems' privacy is not given enough attention. The users not only care about their information revealed during transmission processes but are also concerned about whether the video contents that they have seen were recorded by the pay-TV systems or not. In this work, I propose a novel deniable authentication protocol in a cloud-based pay-TV system, named DAP-TV, aiming to achieve mutual authentication, deniability, and privacy protection in cloud-based pay-TV systems. The unique feature of our scheme is deniability which means a pay-TV system to identify a user is a legal user, but the pay-TV system cannot prove video contents that the user has seen to any third party over an unsecured network. In additon, our scheme is based on chaotic maps, which is a highly efficient cryptosystem and is firstly used to construct a deniable authentication scheme in pay-TV systems. Finally, we give the formal security proof and efficiency comparison with recently related works.