A P 2 P Single Sign - On which remains Single on Smart Spaces ? Enrique

Most single sign-on (SSO) schemes do not handle well scenarios where users work simultaneously with more than one device because their agents do not cooperate. In these scenarios, most SSO systems are really per-machine single sign-on. Besides, most authentication services usually depend on centralized services, may be hard to administer, and do not work well for highly dynamic and partitionable systems. In this work we present the Plan B’s Peer-to-Peer security agent, SHAD. This agent offers SSO even when handling multiple machines and takes advantage of a context infrastructure. In addition, SHAD does not depend on any centralized service. We are using SHAD daily in our smart space and offices for accessing services without authentication obstruction.