Context-awareness and location-awareness for mobile users using multi-level location based time stamp key

Abstract

In nearly correct-based security system for location-based services in wireless networks are secured by pre-shared encrypted, trusted authority, or public key infrastructure. In this system, the nearly correct based authentication and multilevel Time Stamp key establishment are implemented based on spatial temporal location tags. Incorporating the unique physical features of the signals sent from multiple relevant radio sources, the location tags cannot be easily forged by attackers. More specifically, each radio consumer builds a public location tag according to the received signal strength indicators, sequence numbers, and media access control (MAC) addresses of the relevant packets. Each consumer also keeps an encrypted location tag that consists of the packet arrival time information to generate the multilevel Time Stamp keys. As consumers never disclose their encrypted location tags, this system is robust against eavesdroppers and spoofers outside the nearly correct range.