CRM114

CRM114 is a program based upon a statistical method for filtering spam, phishing, and email fraud. While others have done statistical Bayesian filtering based upon the frequency of single word incidents in email, CRM114 achieves a higher rate of spam recognition through creating hits based upon phrases up to five words in length. These phrases are used to form a hidden Markov model of the incoming texts, also called Markovian Discrimination.

CRM114's Markov system was first released to the public in 2001 and has been under continuous improvement since then. With extra contextual recognition, it is one of the more accurate spam filters available, guaranteed to help you make the most of your time and broadband connection. The author claims recognition rates as high as 99.984%, which is over ten times more precise than human accuracy. CRM114's classifier can also be switched to use Lightstone's Winnow algorithm, character-by-character correlation, or other more experimental classifiers which are much more accurate than any Naive Bayesian filtering technique.

As an example of pattern recognition software, CRM114 is a good example of machine learning accomplished with a reasonably simple algorithm. Source code in C is available through the external domains link.

At a deeper level, CRM114 is also a string pattern matching language, similar to grep or even Perl; although it is Turing complete it is highly tuned for matching text, and even a simple (recursive) definition of the factorial takes almost ten lines, looking much like line noise to the uninitiated. Used in this manner, it may be used for many other applications aside from detecting spam. CRM114 uses the TRE approximate-match regex engine, so it's possible to write programs that do not depend on identical strings matching to work correctly.

The name CRM114 is taken from the movie Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb. The CRM-114 discriminator was designed to not get messages unless they were proceeded by the correct 3-digit code.

Some Internet Service Providers are now implementing CRM114 as their server side spam filtering solution against direct marketing spam. In the next few years, it will provide spam protection for outlook express and block spam in outlook as well.

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