m'cast key mgmt: state of the art
not suitable for large-scale deployment
- re-keying traffic rate of same order as join/leave rate
- re-keying requires reliable multicast
- hence Internet research task force, not IETF
MARKS: redefine problem
- arbitrary eviction, but pre-planned
- mainly commercial scenarios (pre-pay) e.g. pay-per-view-TV, usage-charged network games
- zero side-effect on other receivers and sender
- one small unicast set up message per session