Stale-Safe Security Properties for Group-Based Secure Information Sharing

Date
2008-08-12
Authors
Krishnan, Ram
Niu, Jianwei
Sandhu, Ravi
Winsborough, William H.
Journal Title
Journal ISSN
Volume Title
Publisher
UTSA Department of Computer Science
Abstract

Attribute staleness arises due to the physical distribution of authorization information, decision and enforcement points. This is a fundamental problem in virtually any secure distributed system in which the management and representation of authorization state is not centralized. This problem is so intrinsic, it is inevitable that access control will be based on attribute values that are stale. While it may not be practical to eliminate staleness, we can limit unsafe access decisions made based on stale subject and object attributes. In this paper, we propose and formally specify four stale-safe security properties of varying strength which limit such incorrect access decisions. We use Linear Temporal Logic (LTL) to formalize these properties making them suitable to be verified by using model checking. We show how these properties can be applied in the specific context of group-based Secure Information Sharing (g-SIS) as defined in this paper. We specify the authorization decision/enforcement points of the g-SIS system as a Finite State Machine (FSM) and show how this FSM can be modified so as to satisfy one of the stale-safe properties. We formally verify that this FSM satisfies the stale-safe property using a mature model checker called Symbolic Model Verifier (SMV).

Description
Keywords
attribute staleness, security properties, model checking, secure information sharing, trusted computing
Citation
Department
Computer Science