A Temporal Model for Group-Centric Secure Information Sharing

Traditional approach to information sharing focuses on attaching attributes and policies to an object as it is disseminated from producers to consumers in a system. In contrast, group-centric sharing brings subjects and objects together in a group to facilitate sharing. The metaphor “secure meeting room” characterize the Group-Centric approach where participants and information come together to share for some common purpose. In such contexts, authorizations are influenced by the temporal ordering of subject and object group membership. For instance, some subjects may only get future information added to the group while others may also be able to access previously added information. But, the current group-centric sharing model doesn´t consider the time constraint of group enabling and access enabling. For example, a secure meeting room is open only at 8:00-10:00 am and 15:00-17:00 pm every Monday. In this paper, we propose a temporal model for Group-Centric Secure Information Sharing(g-SIS), which takes the temporal intervals of group and access enabling into consideration. We give the temporal logic specifications of the model, and discuss a usage scenario to illustrate practical application in secure meeting system.