Talk: Charlie Clarke on Desktop Search, UW, Monday Mar 6, 3:30 - 4:30pm

You are cordially invited:

WHEN:      Monday March 6, 3:30-4:30pm.
WHERE:     Mary Gates Hall Room 420  (UW Campus, Seattle WA)
            http://www.washington.edu/home/maps/northcentral.html?M
GH
HOST:      Efthimis Efthimiadis
SPONSORS:  The Information School and the ASIS&T UW
Student Chapter

TITLE:     Security for Desktop Search in Multi-User
Environments
SPEAKER:   Charlie Clarke  [mailto:claclarkplg.uwaterloo.ca]
            University of Waterloo

ABSTRACT:

Many desktop search systems maintain per-user indices to
keep track of
file contents. In a multi-user environment this is not a
viable
solution, since a file may have to be indexed many times,
once for every
user that may access the file, causing both space and
performance
problems. On the other hand, having a single system-wide
index for all
users allows for efficient indexing but may require special
security
mechanisms to guarantee that the search results do not
violate any file
permissions.

The talk will present a security model for full-text file
system search,
based on the UNIX security model, and discuss two
implementations of the
model.  The first implementation, based on a postprocessing
approach,
allows an arbitrary user to obtain information about the
content of
files for which he or she does not have read permission. The
second
implementation does not share this problem.  An experimental
performance
evaluation for both implementations will also be presented.

BIO:

Charlie Clarke is an Associate Professor in the Cheriton
School of
Computer Science at the University of Waterloo, Canada. 
Currently, he
is on sabbatical as a Visiting Researcher at Microsoft.  His
research
interests cover many areas of information retrieval,
including
evaluation, performance, question answering, XML retrieval
and user
interaction.

Charlie received his Ph.D. from Waterloo in 1996.  From 1996
to 1999 he
was an Assistant Professor in the Department of Electrical
and Computer
Engineering at the University of Toronto.  He has previously
held
software development positions at a number of computer
consulting and
engineering firms.

Thanks,

--Corprew Reed
ASIS&T UW Student Chapter President
--
Corprew Reed / corprewu.washington.edu / http://www.corprew.org

If you want to build a ship, don't herd people together to
collect wood and
don't assign them tasks and work.  Instead, teach them to
yearn for the
vast and endless sea.  -- Antoine de Saint-Exupery



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