Robustness and Security
Problem…
- Most security protocols rely on a ‘friendly’ environment (reliable multicast, fifo channels, no more than ‘one’ event occurs at a time) for their practical efficiency and termination properties.
- Group communication systems provide a robust set of semantics that allow applications to control their dependence on dynamic environments with faults.
Thus …
- We want to preserve all of the ‘robust’ properties of group communication while adding security.
- Possible issues are: cascading events, failures, ordering semantics, and application messages while computing keys.