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Center for Education and Research in Information Assurance and Security

Recent Attacks on MD5

John Black - University of Colorado at Boulder

Apr 19, 2006

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Abstract

Cryptology is typically defined as cryptography (the construction of
cryptographic algorithms) and cryptanalysis (attacks on these algorithms).
Both are important, but the latter is more fun.

Cryptographic hash functions are one of the core building blocks within both
security protocols and other application domains. In the last few decades
a wealth of these functions have been developed, but the two in most
widespread usage are MD5 and SHA1. Recently, there has been a great
deal of activity regarding the cryptanalysis of MD5.

We survey the recent attacks on the MD5 hash function from the modest
progress in the mid 90s to the startling recent results instigated by
Xiaoyun Wang. We will look at the details of these attacks, some recent
improvements, two applications, and discuss the current outlook on
cryptographic hashing.

About the Speaker

John Black is an Assistant Professor of Computer Science at the University
of Colorado at Boulder. Dr. Black's research interests lie primarily
in cryptography and cryptanalysis, particularly in the construction of
fast and provably-secure algorithms and in the analysis of cryptography
applied to networks and computer systems. Dr. Black received his Ph.D. in
Computer Science from the University of California at Davis in 2000.
He is the recipient of an NSF CAREER award and a check from Donald Knuth
for $2.56.

Unless otherwise noted, the security seminar is held on Wednesdays at 4:30P.M. STEW G52, West Lafayette Campus. More information...

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