标题：Identity-Based Broadcast Encryption with Recipient Privacy
作者：Zhang, Weimin; Xu, Qiuliang; He, Peng
作者机构：[Zhang, Weimin; Xu, Qiuliang] Shandong Univ, Sch Comp Sci & Technol, Jinan, Peoples R China.; [He, Peng] Xian Commun Inst, Xian, Peoples R China.
会议名称：3rd IEEE International Conference on Computer Science and Information Technology (ICCSIT)
会议日期：JUL 09-11, 2010
来源：PROCEEDINGS OF 2010 3RD IEEE INTERNATIONAL CONFERENCE ON COMPUTER SCIENCE AND INFORMATION TECHNOLOGY (ICCSIT 2010), VOL 8
关键词：identity-based; broadcast encryption; recipient privacy
摘要：In many broadcast systems, it is important to protect both distributed content and the identities of authorized recipients. But many systems fail to protect the privacy of their users. In this paper, we propose the first identity-based broadcast encryption scheme with recipient privacy, enables the efficient encryption of messages to multiple recipients without revealing the identities of authorized recipients. In our scheme, the size of private keys is constant, the public key and ciphertexts are of size linear in the maximal size m of the set of authorized recipients, which is smaller than the number of possible users in the system. Finally we prove the security of our scheme by using the GDDHE framework.