A novel authorization delegation scheme for multimedia social networks by using proxy re-encryption

作者：Feng, Weining; Zhang, Zhiyong^*; Wang, Jian; Han, Linqian

来源：Multimedia Tools and Applications, 2016, 75(21): 13995-14014.

DOI：10.1007/s11042-015-2929-2

• Multimedia social networks
• Multimedia security
• Authorization
• Delegation
• Proxy re-encryption
• Digital rights management

To solve the existing problem of the multimedia social networks platforms, for instance, the copyrighted or private multimedia content can not be safely shared among users, we proposed a novel authorization delegation scheme based on the proxy re-encryption mechanism. This scheme enables one user to delegate digital rights/privileges to another or the group of users, and achieves fine-grained authorization delegation. The ciphertext of content encryption key (CEK) was re-encrypted by the proxy with re-encryption key, which is generated by delegator, and then the ciphertext was sent to the delegatee only who could decrypt the ciphertext. The CCA security of proxy re-encryption was formally proved that this scheme realized the authorization delegation while ensuring the confidentiality of both the sharing content and the delegator's private key. Besides, the privileges can be revoked when the usage control policies have not yet been satisfied. Finally, we demonstrated in detail that the proposed scheme was applied to a multimedia social network prototype called by CyVOD MSN, and it achieved the security share of multimedia content and the functionality of digital rights management, together with better resolving the issue of limited access control list.

• 出版日期2016-11
• 单位中国人民解放军信息工程大学; 河南大学