Using Data Mining Techniques and the Choice of Mode of Text Representation for Improving the Detection and Filtering of Spam

Using Data Mining Techniques and the Choice of Mode of Text Representation for Improving the Detection and Filtering of Spam

Reda Mohamed Hamou (Dr. Moulay Taher University of Saïda, Algeria) and Abdelmalek Amine (Dr. Moulay Taher University of Saïda, Algeria)
DOI: 10.4018/978-1-4666-7272-7.ch018
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Abstract

This chapter studies a boosting algorithm based, first, on Bayesian filters that work by establishing a correlation between the presence of certain elements in a message and the fact that they appear in general unsolicited messages (spam) or in legitimate email (ham) to calculate the probability that the message is spam and, second, on an unsupervised learning algorithm: in this case the K-means. A probabilistic technique is used to weight the terms of the matrix term-category, and K-means are used to filter the two classes (spam and ham). To determine the sensitive parameters that improve the classifications, the authors study the content of the messages by using a representation of messages by the n-gram words and characters independent of languages to later decide what representation ought to get a good classification. The work was validated by several validation measures based on recall and precision.
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State Of The Art

Among the anti-spam techniques exist in the literature include those based on machine learning and those not based on machine learning.

The Techniques Not Based on Machine Learning

Heuristics, or rules-based, the analysis uses regular expression rules to detect phrases or characteristics that are common in spam, and the amount and severity of identified features will propose the appropriate classification of the message. The history and the popularity of this technology has largely been driven by its simplicity, speed and accuracy. In addition, it is better than many advanced technologies of filtering and detection in the sense that it does not require a learning period. Techniques based on signatures generate a unique hash value (signature) for each message recognized spam. Filters signature compare the hash value of all incoming mail against those stored (the hash values previously identified to classify spam e-mail). This kind of technology makes it statistically unlikely that a legitimate email to have the same hash of a spam message. This allows filters signatures to achieve a very low level of false positives. The blacklist is a technique that is simple common among almost all filtration products. Also known as block lists, blacklists filter e-mails from a specific sender. White lists, or lists of authorization, perform the opposite function, to correctly classify an email automatically from a specific sender. Currently, there is a spam filtering technology based on traffic analysis provides a characterization of spam traffic patterns where a number of attributes per email are able to identify the characteristics that separate spam traffic from non-spam traffic.

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