Self-Healing Key Distribution with Revocation

  • Authors:
  • Jessica Staddon;Sara Miner;Matt Franklin;Dirk Balfanz;Michael Malkin;Drew Dean

  • Affiliations:
  • -;-;-;-;-;-

  • Venue:
  • SP '02 Proceedings of the 2002 IEEE Symposium on Security and Privacy
  • Year:
  • 2002

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Abstract

We address the problem of establishing a group key amongst a dynamicgroup of users over an unreliable, or lossy, network.We term ourkey distribution mechanisms self-healing because users arecapable of recovering lost group keys on their own, withoutrequesting additional transmissions from the group manager, thuscutting back on network traffic, decreasing the load on the groupmanager, and reducing the risk of user exposure through trafficanalysis. A user must be a member both before and after the sessionin which a particular key is sent in order to be able to recover thekey through self-healing. Binding the ability to recover keys tomembership status enables the group manager to use short broadcaststo establish group keys, independent of the group size.Inaddition, the self-healing approach to key distribution isstateless, meaning that a group member who has been off-line forsome time is able to recover new session keys immediately aftercoming back on-line.