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Distributed Checksum Clearinghouse
Distributed Checksum Clearinghouse (also referred to as DCC),
is a
hash sharing method of
spam email detection. The basic logic in DCC is that most spam mails
have several copies floating around. So If one server finds a mail to be
spam then it does a checksum of the mail and posts the hash to a
central, colloborative, repository. The next server receiving this mail
would get the DCC results and can more easily identify the spam.
When you get that message a little later on in the morning, your mail system
asks that online database, "Has anyone reported this as spam?". The online
database can report back "yes", allowing your mail system to raise the spam
score for that message. DCC works over the UDP protocol and hence is not very
bandwidth
intensive.
DCC is resistant to
hashbusters because "the main DCC checksums are fuzzy and ignore aspects of
messages. The fuzzy checksums are changed as spam evolves".
External links
Home | Up | Anti-spam appliances | Content filtering | Context filtering | Distributed Checksum Clearinghouse | DomainKeys | Greylisting | GTUBE | Hashbusters | MULE email | Tarpit
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