A controllable delegation scheme for the subscription to multimedia platforms

Abstract

With the development of the Internet, various multimedia platforms have sprung up like mushrooms after rain. Through subscription, people can enjoy the rich resources provided by the multimedia platform. To attract more subscribers, the multimedia platform will give users the ability to delegate access rights. Because in this way, the subscriber can share resources with his/her family or friends. However, the delegation ability should be controllable. Otherwise, there will be a risk of delegation abuse and damage to the interests of the multimedia platform. Therefore, we propose a new Key-Policy Attribute-Based Encryption (KP-ABE) scheme supporting key delegation ability, traceability, and single-layer delegation, which can work as a controllable delegation scheme for the subscription to multimedia platforms. Firstly, KP-ABE can realize access control to resources and protect the security of resources through encryption. Secondly, the key delegation ability can meet the requirement of users to share their access rights. Lastly, traceability and single-layer delegation can limit the key delegation ability of users, so as to resist key delegation abuse. In addition, the proposed scheme supports large universe and tree access structures and is established on prime-order groups, which makes it scalable, expressive, and efficient.