An Improved Anonymous Authentication Protocol for Location-Based Service

Abstract

The authentication protocols are implemented to provide identity authentication for communication entities. With the increasing demand of network security and the development of technology, the anonymous authentication protocol for LBS (location based service) has gradually become a research hotspot and attracted extensive attentions, which provides anonymity of the user, confidentiality of location information and identity authentication simultaneously. An efficient and secure anonymous authentication protocol with enhanced privacy for location based service using asymmetric cryptography was proposed by Memon et al. in 2015. However, some scholars pointed out some weaknesses of Memon et al.'s protocol, such as the lack of resistance to password change attack, privileged insider attack and offline password guessing attack. They also pointed out the protocol failed to prevent adversaries from getting the sessionspecific temporary information. Besides, the mutual authentication was not perfect. Therefore, in this paper, we further analyze the security of Memon et al.'s protocol and propose an improved anonymous authentication protocol for location based service. We use the timestamp mechanism and rely on CDH (Computational Diffie-Hellman) problem to improve security primarily. The security of the proposed protocol is verified using BAN logic and the performance comparison and efficiency analysis are carried out. The results show that our improved protocol has higher security with little more computation cost.

Old Rebellions, New Minorities: Ma Family Leaders and Debates Over Communal Representation Following the Xinhai Rebellion, 1911

“…One of Ma Qi's earliest acts was to put down an uprising by a Royalist faction (zongshe dang) in Qinghai, which intended to restore the Qing by calling on Tibetans and Mongolians to join the cause on the basis that these were the groups for whom the pluralist, non-Han Qing still held an appeal. 59 Fuxiang, meanwhile, sent a brigade led by his brother against Mongol separatists. Ever a strategic propagandist, Fuxiang was careful to record his victories, creating memorial stele for Republican dead and writing his Ningxia dominions into the annals of Republican loyalty.…”