Spam messages are an increasing threat to mobile communication. Several mitigation techniques have been proposed, including white and black listing, challenge-response and content-based filtering. However, none are perfect and it makes sense to use a combination rather than just one. We propose an anti-spam framework based on the hybrid of contentbased filtering and challenge-response. A messag...

Naive Bayes is very popular in commercial and open-source anti-spam e-mail filters. There are, however, several forms of Naive Bayes, something the anti-spam literature does not always acknowledge. We discuss five different versions of Naive Bayes, and compare them on six new, non-encoded datasets, that contain ham messages of particular Enron users and fresh spam messages. The new datasets, wh...

We conducted an empirical study of the clustering behavior of spammers and explored the group-based anti-spam strategies. We propose to block spammers as groups instead of dealing with each spam individually. We empirically observe that, with a certain grouping criteria such as having the same URL in the spam mail, the relationship among the spammers has demonstrated highly clustering structure...

This paper analyses the anti-corruption activities of 24 transition countries in the period 1999-2002. These activities are divided into omnibus anti-corruption programmes, legislative reform aimed at tackling corruption, and adherence to international anti-corruption conventions. The paper presents a new measure for determining the extent of anti-corruption activity undertaken in these three c...

Spam is unsolicited bulk email which is extremely annoying to the recipients and the ISPs. However, most of the traditional spam filtering methods commonly neglect the bulk character of spam. This paper proposes a model of cooperative anti-spam system based on multilayer agents. We compared our model to the stateof-the-art and found that our model achieved better performance and robustness on s...

Spam, the electronic equivalent of junk mail, affects over 600 million users worldwide. Even as anti-spam solutions change to limit the amount of spam sent to users, the senders adapt to make sure their messages are seen. This paper looks at application of the artificial immune system model to protect email users effectively from spam. In particular, it tests the spam immune system against the ...

the term ‘spam’ addresses unsolicited emails sent in bulk; therefore, the term‘financial fraud spam’ refers to unwanted bulk emails in which different tricks and techniques areemployed to swindle money from the recipients. estimates show that more than 80% of worldwideemail traffic in 2011 was spam. it should be noted that while the number of daily spam emails in2002 was 2.4 billion, this numbe...

In this paper we present a detailed study of the behavioral characteristics of spammers based on a two-month email trace collected at a large US university campus network. We analyze the behavioral characteristics of spammers that are critical to spam control, including the distributions of message senders, spam and non-spam messages by spam ratios; the statistics of spam messages from differen...

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Blogs are becoming an increasingly popular target for spammers. The existence of multiple vectors for spam injection, the potential of reaching many eyeballs with a single spam, and limited deployment of anti-spam technologies has led to a sustained increase in the volume and sophistication of attacks. This paper reviews the current state of spam in the blogosphere at large and in particular as...