DISTRIBUTED CHECKSUM CLEARINGHOUSE PDF

Abstract In this note we discuss techniques for determining the automorphism group of a genus g hyperelliptic curve Xg defined over an algebraically closed field k of characteristic zero. The first technique uses the classical GL2 k -invariants of binary forms. This is a practical method for curves of small genus, but has limitations as the genus increases, due to the fact that such invariants are not known for large genus. The second approach, which uses dihedral invariants of hyperelliptic curves, is a very convenient method and works well in all genera.

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Jump to: navigation , search Distributed Checksum Clearinghouse also referred to as DCC is a hash sharing method of spam email detection[ citation needed ]. The basic logic in DCC is that most spam mails are sent to many recipients. The same message body appearing many times is therefore bulk email. DCC identifies bulk email by taking a checksum and sending that checksum to a Clearinghouse server.

The server responds with the number of times it has received that checksum. An individual email will create a score of 1 each time it is processed. Bulk mail can be identified because the response number is high. The content is not examined. 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" [1] DCC is likely to identify mailing lists as bulk email unless they are white listed. Likewise, repeatedly sending the same email to a server increases its number in the server, and, therefore, the likelihood of it being treated as spam by others.

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distributed checksum clearinghouse

Jump to: navigation , search Distributed Checksum Clearinghouse also referred to as DCC is a hash sharing method of spam email detection[ citation needed ]. The basic logic in DCC is that most spam mails are sent to many recipients. The same message body appearing many times is therefore bulk email. DCC identifies bulk email by taking a checksum and sending that checksum to a Clearinghouse server. The server responds with the number of times it has received that checksum. An individual email will create a score of 1 each time it is processed.

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Distributed Checksum Clearinghouse

External links The basic logic in DCC is that most spam mails are sent to many recipients. The same message body appearing many times is therefore bulk email. The server responds with the number of times it has received that checksum. An individual email will create a score of 1 each time it is processed. Bulk mail can be identified because the response number is high. The content is not examined. DCC is resistant to hashbusters because "the main DCC checksums are fuzzy and ignore aspects of messages.

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