Thursday, Sep. 4, 2003
4 - 5 PM
2310 CS
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Joachim Rosenthal (web)
Department of Mathematics (web)
University of Notre Dame (web)
Public key cryptography and semi-group actions
The traditional Diffie-Hellman and
ElGamal protocols are based on the
hardness of the discrete logarithm
problem in a finite group.
The goal of this talk is to give a
generalization of these protocols
built from semi-group actions on
arbitrary sets. This then results in
a generalized Diffie-Hellman key
exchange and a generalized ElGamal
one-way trapdoor function.
Our main attention will be several
interesting examples of semi-ring
actions on a semi-module. Several new
examples will be presented which may
lead to new one-way trapdoor
functions.
The presented results constitute joint
work with Gérard Maze (web)
and Chris Monico (web).
 Cookies will be served at 3:30 PM in 2310 CS.
The speaker will also give a Math seminar
about the "Three challenges of Claude
Shannon". For more information please see
this
announcement.
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Monday, Sep. 22, 2003
3:30 - 4:30 PM
2310 CS
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Joint Theory / Security Seminar
Dr. Sandeep Bhatt
Managing Network Insecurity
Many factors conspire to make enterprise
networks intractable to secure. While
hackers, security flaws, viruses and worms
gather daily headlines, one dirty little
secret remains undisturbed - the dismal state
of network management tools and
practices. Current network management practice
is labor-intensive, costly and
unreliable. Multiple administrators are tasked
to configure and manage individual network
components independently, with the expectation
that, when put together, somehow everything
will work out "just right." Analyzing a
network can take several weeks, as there are
no tools (other than brute force scans) to
answer even fundamental questions such as:
"What remote services can be accessed from my
workstation?"
This talk will describe the "Smart Firewalls"
system for network security analysis and
control. Designed to view an entire network as
a single system whose global behavior can be
checked efficiently from the state of
individual components, Smart Firewalls has
been successfully demonstrated in several DoD
experiments, and has been used to analyze
commercial enterprise network security.
Cookies will be served at 3 PM in 2310 CS.
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