[Colloquium] Reminder: TTI-C Talk Today @ 3:00pm

[Katherine Cumming]

TOYOTA TECHNOLOGICAL INSTITUTE TALK
 
Speaker:  Monica Chew, UC Berkeley
Speaker's homepage:  www.cs.berkeley.edu/%7Emmc/
 
Time:  Thursday, March 17, 2005 @ 3:00pm
Location:  TTI-C Conference Room 
Refreshments provided
 
Title: Human or Not? How To Tell the Difference
 
Abstract: 
I present work on CAPTCHAs, tests to distinguish humans from machines in
an online environment. CAPTCHAs mitigate abuse of internet services. For
example, adversaries write software robots to register free email
accounts and use the accounts to send spam. CAPTCHAs allow us to
distinguish legitimate requests from automated requests. I implement and
measure CAPTCHAs based on text recognition, image recognition, and
collaborative filtering. Contributions of this work include a new metric
for evaluating CAPTCHAs, the most secure text-based CAPTCHA to date, the
first study of image recognition CAPTCHAs, and first proposal for
collaborative filtering CAPTCHAs.

Bio: Monica Chew finished her PhD in computer science at the University
if California, Berkeley in December 2004. Her thesis advisor was Doug
Tygar, and her main research area is computer security. 
 
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If you have questions, or would like to meet the speaker, please contact
Katherine at 773-834-1994 or kcumming at tti-c.org.   For information on
future TTI-C talks and events, please go to the TTI-C Events page:
http://www.tti-c.org/events.html.  TTI-C (1427 East 60th Street,
Chicago, IL  60637)
 
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