Alexander Williams

“The "I challenge your challenge!" scenario is particularly amusing. And on top of the two issues Scott highlights, there are other social problems with challenge/response spam blocking.
Although I've had great success with POPFile, which uses Bayesian filtering techniques, I had no idea that there's an even better technique: Markovian filtering. That's what the CRM114 Discriminator* uses. There's an outstanding slide deck (pdf) that explains how it all works. In a nutshell, Markovian filtering weights phrases and words, whereas Bayesian filtering only looks at individual words. How much better is it? I'll let the CRM114 author, Bill Yerazunis, pitch it:”