UCSMdess: Ubiquitous computing service model based on D-S Evidence Theory and extended SPKI/SDSI

Ubiquitous computing systems typically have lots of security problems in the area of service supply. The service sorts and levels, the security delegation of services, the simple privacy protection of principal and the trust computing etc are all these unsolved problems. In this paper, UCSMdess, a new novel ubiquitous computing service model based on D-S Evidence Theory and extended SPKI/SDSI is presented. D-S Evidence Theory is used in UCSMdess to compute the trust value from the ubiquitous computing environment to the principal or between the different ubiquitous computing environments. SPKI-based authorization is expanded by adding the trust certificate in UCSMdess to solve above problems in the ubiquitous computing environments. The service model with the algorithm of certificate reduction is then given in the paper.