Selected Recent Talks
September. 2004 - Martel
Small Worlds
[G1] C. Martel and V. Nguyen. Analyzing Kleinberg's (and other) small-world
models. In the 23rd ACM Symposium on Principles of Distributed Computing,
pp. 179-188, July, 2004.
In this paper we show that Kleinberg's basic
model has expected diameter O(log n) and we suggest improved routing algorithms
to come closer to this bound.
powerpoint for this talk
Authentic Publication
Integrity critical databases, such as financial information used in high-value decisions, are frequently published over the internet. Publishers of such data must satisfy the integrity, authenticity, and non-repudiation requirements of end clients. Providing this protection over public data networks is costly. This is partly because building and running secure systems is hard. In practice, large systems cannot be verified to be secure and are frequently penetrated. The negative consequences of a system intrusion at the data publisher can be severe. The problem is further complicated by data and server replication to satisfy availability and scalability requirements.
We aim to reduce the trust required of the publisher of large, infrequently updated databases. To do this, we separate the roles of data owner and data publisher. With a few trusted digital signatures on the part of the owner, an untrusted publisher can use techniques based on Merkle hash trees to provide authenticity and non-repudiation of the answer to a database query.
More info is at:
Authentic Publication Website
powerpoint for this talk