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Seminars given
November 25, 2002 - Secure Intrusion-tolerant Replication on the Internet
by Christian Cachin
| Abstract: | This talk describes the secure intrusion-tolerant replication architecture
(SINTRA) for coordination in asynchronous networks subject to Byzantine
faults. SINTRA supplies a number of group communication primitives,
such as binary and multi-valued Byzantine agreement, reliable and consistent
broadcast, and an atomic broadcast channel. Atomic broadcast immediately
provides secure state-machine replication. The protocols are designed for an
asynchronous wide-area network, such as the Internet, where messages may be
delayed indefinitely, the servers do not have access to a common clock, and up
to one third of the servers may fail in potentially malicious ways. Security
is achieved through the use of threshold public-key cryptography, in
particular through a cryptographic common coin based on the Diffie-Hellman
problem that underlies the randomized protocols in SINTRA.
The talk will focus on the cryptographic agreement and broadcast protocols in
SINTRA and also describe a prototype implementation of SINTRA. |
