RISC Seminars (Research on Information Security and Cryptology)
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RISC Seminar
| Date: | March 1 |
| Location: | CWI, Room M280 |
| Schedule: | |
| 16:00-17:00 | Vinod Vaikuntanathan (MIT): Random Selection and Byzantine Agreement in the Full-Information Model Abstract: Random Selection -- one of the most basic protocol problems in
cryptography and distributed computing -- asks for mutually distrusting
parties to jointly generate a random string. Feige (FOCS 99) and Russell
and Zuckerman (FOCS 98) construct elegant random selection protocols
that run in log* n rounds, in the full-information model. These
protocols, however, assume a *built-in reliable broadcast channel*. We
construct random selection protocols that run in O(log n) rounds in the
plain model, namely, *without* reliable broadcast channels. One of the
consequences of this result is an O(log n)-round randomized Byzantine
Agreement protocol, improving on the previous best result of (n/log n)
rounds (Chor-Coan '85).
Based on joint work with Shafi Goldwasser and Elan Pavlov (FOCS 06). |
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