DISTRIBUTED CHECKSUM CLEARINGHOUSE PDF

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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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.

First we define the normal decomposition of a hyperelliptic curve with extra automorphisms. Then dihedral invariants are defined in terms of the coefficients of this normal decomposition. We define such invariants independently of the automorphism group Aut Xg. However, to compute such invariants the curve is required to be in its normal form. This requires solving a nonlinear system of equations. We find conditions in terms of classical invariants of binary forms for a curve to have reduced automorphism group A4, S4, A5.

As far as we are aware, such results have not appeared before in the literature.

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Distributed Checksum Clearinghouse

Experiences with greylisting by John R. I outline a taxonomy of greylisters and report some statistics both on anti-spam effectiveness and its effect on non-spam mail. For many years, large amounts For many years, large amounts of spam has been sent through purpose-built spamware, rather than normal MTAs. If recipient hosts can identify distinctive characteristics of spamware that differ from legitimate MTAs, the recipient hosts can reject mail from spamware during the SMTP session, avoiding the need to receive the spam. Show Context Citation Context

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distributed checksum clearinghouse

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. First we define the normal decomposition of a hyperelliptic curve with extra automorphisms. Then dihedral invariants are defined in terms of the coefficients of this normal decomposition.

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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.

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