Hi Kurt,
Kurt Wismer to Paul Walker, 17 Feb 98 22:01.
 KW> world requires that the virus database be reasonably small, so you're
 KW> thinking how do they fit every byte of every virus in the database -
 KW> to which i say "checksums"...
Or what others call "fingerprints", yes. 
 KW> these can actually be called virus signatures, whereas scan strings do
 KW> not necessarily uniquely and exactly identify a virus, these do (with
 KW> the exception of cryptographic collision in the real world
But you don't know which method a virus scanner uses, unless it explicitly 
tells you.
  Paul              (p.r.walker@warwick.ac.uk)                 
... "Learn about the force, Luke." - Obi Wan
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