On-line value-added services enable a client to purchase services from Service Provider (SP) via the Internet using the client's computers or smart mobile devices. Because of the sensitive information that may be involved, client anonymity is always required in such transactions so that the client's identity is known only to the client and the requested SP. In this talk, I will talk about INDEX, an ID-based remote authentication scheme with client anonymity. INDEX provides client anonymity using the concept of client index, which is guaranteed by a new design of ID-based signature. Compared with previous ID-based schemes, INDEX reduces the running time while still providing client anonymity for the first time.

Dr. Xuefei Cao is a visiting scholar in the Department of Computer Science at Duke University. Her research interests include network security and applied cryptology. Before she joined Duke, she worked as a researcher in China Mobile Research Institute. She received a PhD in Communication and Signal System, and a BE in Telecommunication Engineering from Xidian University in 2008 and 2003, respectively.