On Wed, 5 Mar 2003, Vernon Schryver wrote:
Any system to detect "similar but not identical"
messages can be thwarted if it uses a checksum scheme, and is too slow
to be practical if it uses more sophisticated message-closeness
measures.
You are quite wrong about that. Simplistic checksum schemes are easily
thwarted, but the DCC and other checksum schemes including Cloudmark are
not simplistic checksums.
Any checksum scheme that can be made to produce different values
for different messages that I select can be thwarted.
Any checksum scheme that cannot be made to produce different values
for different messages that I select is useless for distinguishing
spam from non-spam.
--
David.
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