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The safety of a text-based login depends on the entropy of the text. The more unpredictable, the safer. Passphrases have more entropy than simple passwords, but we don't yet have an easy way to analyze the safety of passphrases. For passwords, we can have a stoplist of common words, and check those. Last week, I'd implemented a data structure for probabilistic set membership that's even denser than Bloom filters, and this weekend I'd used the Google Books ngram dataset to find a set of common words, common pairs of words, and common triples of words, then loaded that into the browser and implemented a few Javascript views to visualize that. http://www.leebutterman.com/passphrase-safety
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