ICHIGAN Security - A Security Architecture That Enables Situation-Based Policy Switching

Project ICHIGAN is a voluntary-based attempt to build a reference IT architecture for local governments that can withstand large-scale natural disasters. This architecture is unique in that 1) it has the concept of {em phases} of the situation for which different priorities on non-functional requirements are applied, and 2) the functionalities and services provided by the IT systems in the suffered area will be taken over by those of the ``coupled'' local government. These features pose specific challenges on the information security policy, especially because different policies need to be applied for the different modes. This paper describes two key elements to enable the policy, policy templates and deferred authentication.