关键词: 数字版权管理, 代理重加密, 内容共享, 许可授权

Abstract:

In order to protect the copyright of digital content, an authorization protocol of multimedia digital rights management based on proxy re-encryption is proposed. The proposed protocol allows content providers to encrypt multimedia content on their clients, and allows the users to share the encrypted multimedia content and apply license from license server. After obtaining the license, the users can apply the content encryption key from key proxy server. The key proxy server re-encrypts the content encryption key and sends the encrypted content encryption key to the users, while license server cannot get the content encryption key. Based on the proposed protocol, a content sharing platform for digital TV programs in cloud computing is developed. The comparison results and practical application show that the proposed protocol does not need to re-encrypt content when sharing, and can effectively resist the collision attacks, which is efficient and secure.

Key words: digital rights management, proxy re-encryption, content sharing, authorization