A Proxy E-Raffle Protocol Based on Proxy Signatures

Nasrollah Pakniat and Ziba Eslami

Department of Computer Science

Shahid Beheshti University, G.C.

Tehran, Iran

n.pakniat@mail.sbu.ac.ir, z_eslami@sbu.ac.ir

Abstract

In 2009, Chang and Cheng proposed an efficient proxy raffle protocol. In their scheme, the raffle

tickets are known by participants as well as raffle organizers. Hence, unless we implicitly add the

unrealistic assumption that the organizer is trustworthy, this may cause problems and threaten the

security of the e-raffle from the viewpoint of participants. In this paper, we use the concept of proxy

signatures and symmetric cryptography to propose an efficient proxy raffle scheme which overcomes

this weakness. We show that the proposed scheme achieves all other security requirements mentioned

in the literature. The proposed scheme is shown to outperform the scheme of Chang and Cheng in

terms of communication load and computational complexity.

Keywords: E-Raffles, Proxy raffle protocol, Proxy signature

Journal of Wireless Mobile Networks, Ubiquitous Computing, and Dependable Applications (JoWUA),

Vol. 2, No. 3, pp. 74-84, September 2011 [pdf]