Articles and details about the 340
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- Encyclopedia of observations - A collection of observations about the cipher text
- Comparison of cipher alphabets
- Comparison of character repetition rates
- Comparison of sequence repetition rates
- Levenshtein distance analysis - A look at the occurrences of repeated sequences that are not exact matches.
- Quadrant analysis - Do the n-gram counts improve If we split the cipher text into four quadrants?
- Quadrant analysis Part 2 - An expansion of the previous quadrant analysis experiment. Is it possible to produce quadrant arrangements that increase the number and quality of homophones detected algorithmically?
- Information theory (entropy, randomness, etc)
- FBI analysis from Dan Olson
- Cipher-related excerpts from case documents
- Word frequency analysis (word frequencies derived from a corpus of Zodiac correspondences)
- Omnidirectional repetitions - An investigation into patterns that repeat in arbitrary directions by following "snake-like" paths.
- (Above link is broken. Click here for an archived copy.)
- "Complexification" - Did the cipher author begin with a simpler set of cipher symbols, then "complexify" certain symbols to further flatten the symbol distributions?
- Substring ranking - Can we apply measurements that give us a way to find interesting sections of cipher text for focused attacks?
- Catalog of repeating fragments - A comprehensive list of portions of cipher text that occur more than once in the cipher text.
- Cipher Legitimacy - Are the Zodiac ciphers real, or are they hoaxes?
- Corpus Experiments - A collection of corpus-based experiments performed on the Zodiac ciphers
- Outline of ongoing work on Z340
- Another outline of ongoing work on Z340
