Spam Filtering using Naïve Bayesian Classification
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1 Spam Filtering using Naïve Bayesian Classification Presented by: Samer Younes
2 Outline What is spam anyway? Some statistics Why is Spam a Problem Major Techniques for Classifying Spam Transport Level Filtering Fingerprint Analysis Lexical Analysis Artificial Intelligence Statistical Analysis Heuristics Naïve Bayesian Classification Some Definitions Equations Evaluation Measures Conclusions
3 So What is Spam? Spam = Unsolicited Bulk e Used to promote: mass advertising & marketing Scams and Fraud Other less than desirable content Reasons for using e Cheap and cost effective No widely spread legislation banning its use for such purposes
4 Some Statistics Current spam traffic accounts for: 60% of all e traffic Approximately 10 billion messages / day Approximately 2.6 trillion messages / year Equivalent to 2000TB / day
5 Some Statistics (ctnd( ctnd.) Source: Brightmail Incorporated Loss of Productivity adds up to more than $10 billion in the US alone!
6 Why is Spam a Problem Financial Costs Resource Abuse Storage Employee Productivity Over-Burdened Mail Servers Fraud Social Costs
7 So how to Stop Spam Several Techniques Exist: Transport Level Filtering Fingerprint Analysis Lexical Analysis Artificial Intelligence Statistical Analysis Heuristics
8 Transport Level Filtering Transport Level Filtering: Secure SMTP Realtime Blackhole Lists (RBLs( RBLs)
9 Fingerprint Analysis Similar to Anti-Virus Software Requires large fingerprint database Not a viable solution considering subtle variations in messages
10 Lexical Analysis Context examination of words or phrases Uses rule based discrimination and weighted words to filter
11 Artificial Intelligence Uses Neural Networks techniques to filter out spam Spam Incoming NOT Spam
12 Statistical Analysis Includes Bayesian classifiers Similar classification rates to NN Associates probabilities to words Will be covered in subsequent slides
13 Heuristics Is a combination of the above listed methods Used in large enterprises architectures
14 Naïve Bayesian Classification Some Definitions Corpus = Body of words used in statistical classification and training. Vector v = (x 1, x 2,., x n ) is an array of values with associated attributes. (in spam filters attributes are words) Lemmatizer = Engine that returns the root of a word (i.e. Lem( going going ) ) = go ) Stop-List = List of frequently used wording (i.e. the, is,, etc )
15 What is Bayesian Classification Given a document d create a vector v of values and compute the mutual information (MI) of each candidate using the following formula: MI ( X ; C) = P( X = x, C x { 0,1}, c { spam, legitimate} P( X = x). P( C = c) = c).log P( X = x, C = c) Taking the attributes with highest MI s s they are compared to frequency ratios from the training corpus.
16 What is Bayesian Classification (ctnd.) Having computed the MI s s a new vector v is constructed and fed to the following formula: P( C = c X = x) = P( C = c). P( C i= 1 P( X = k). k { spam, legitimate} i= 1 n n i = x i P( X C = c) i = x i C = k) With the assumption that the various attributes of vector v are conditionally independent
17 What is Bayesian Classification (ctnd.) The classification is committed if the following criteria is satisfied: P( C P( C spam X = legitimate = X x) = x) > λ The threshold λ is usually set to 999 in order to avoid classifying legitimate e as spam
18 How it all fits together
19 Results and Measures Results based on the testing of the Bayesian Classifier were as follows:
20 Results and Measures (ctnd( ctnd.) Evaluation was also performed to assess the usefulness of lemmatizers and stop-lists in increasing the accuracy of the filter with a threshold of 999
21 Results and Measures (ctnd( ctnd.) The following table shows precision, recall and accuracy of the filter with various configurations. TCR = Total Cost Ratio Higher TCR = Better Results
22 Conclusions Authors believe naïve bayesian classification is not viable. In vivo results of the technique have shown a high degree of accuracy in catching spam. This technique is used in various commercial products targeted mainly to the single user.
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