CNDS Papers Group Communication Exploring Robustness in Group Key Agreement ps , ps.gz , pdf .
Key agreement is a critical part of providing security services for group communication systems.
Most of the current contributory key agreement protocols are not designed to tolerate failures and membership changes during execution. In this paper we present the first robust contributory key agreement protocols resilient to any sequence of events while preserving the group communication membership and ordering guarantees. A Cost-Benefit Approach ps , ps.gz , pdf . We present a protocol that is analytically grounded, yet also achieves real world goals, such as simplicity, fairness and minimal resource usage. We base our flow control protocol on the Cost-Benefit algorithmic framework for resource management.