Method for judging same mails based on mail finger prints

Abstract

The invention provides a method for judging same mails based on mail finger prints. The method comprises the steps of establishing basic finger print segmented words and deformed finger print segmented words for mail finger prints of spam samples and to-be-judged mails, matching and counting the same elements occurring in a spam sample set X and a to-be-judged mail set Y, thereby obtaining the repeat degree C; calculating a similar proportion V of all same elements in the set X and the set Y, and judging that the mails are the same mails if the similar proportion V is greater than or equal to a threshold value K; and judging that the mails are not the same mails if the similar proportion V is smaller than the threshold value K, wherein the calculation formula of the similar proportion V is V=2*C / (N+M)*100 %. According to the method, batch comparison processing is carried out on the to-be-judged mails, the same mails are judged efficiently, the scientific reference is provided for judging whether received new mails in a later period are spam or not, and the identification efficiency for the spam sent by the same template is improved.

Description

technical field [0001] The invention relates to the technical field of anti-spam, in particular to a method for judging the same mail based on mail fingerprints. Background technique [0002] Spam (Spam) has always been a hot issue in the mail system, but there has been no clear definition. After research, people found that spam has an obvious feature: sending a large number of emails with similar or identical content repeatedly. For this feature, people use a series of means to reject spam. By monitoring the number of repeated emails sent and designing a threshold, when the number of delivery is greater than this threshold, it is judged that the email is likely to be spam. By comparing mail fingerprints (Mail Finger Print, mail fingerprint, referred to as "MFP") to determine whether the mail is spam. Generate and save fingerprints (Finger Print, “FP”) for identified spam emails, and compare the fingerprints of new emails with it to determine whether the emails are spam e...

AI Technical Summary

Problems solved by technology

[0004] In this prior art, spammers have certain limitations when encapsulating the disturbing information, because in this prior art, it is impossible to artificially encapsulate the disturbing information of the abstract or the body part of the mail, such as: garbled characters, Alien characters or misplaced typesetting text or pictures containing text and many other complex interferences to effective recognition, so that it is impossible to judge whether two emails are the same email by identifying the entire content of the email as email fingerprint information

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