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Essentially it is a preprocessor for gzip that removes redundancy from a sorted list of words, and typically shrinks an input wordlist by some 50% without negatively impacting gzip's ability to further compress the file. In the new version of the DAWG code - slightly improved over the version that ships with Crack v5.0, but fundamentally the same - all you need do is: 1. sort the wordlist into normal Unix order. (beware localization!) 2. for each word that the DAWG preprocessor reads... 3. count how many leading characters it shares with the previous word that was read... 4. encode that number as a character from the set [0-9A-Za-z] for values 0..61 (if the value is >61 then stop there) 5. print said character (the encoded number) and the remaining stem of the word 6. end-for-loop eg: foo foot footle fubar fub grunt compresses to: #!xdawg magic header 0foo first word has no letters in common with anything 3t next has three letters in common, and a 't' 4le "foot" + "le" 1ubar "f" + "ubar" 3 "fub" + "" => truncation 0grunt back to nothing in common Inspiration for using DAWG in Crack came from Paul Leyland back in the early 1990s, who mentioned something similar being used to encode dictionaries for crossword-puzzle solving programs; we continue to be astonished at how effective DAWG is on sorted inputs without materially impacting subsequent compression (ie: gzip); a gzipped-DAWG file is also typically about 50% of the size of the gzipped non-DAWGed file. Just goes to prove that knowledge of the sort of input you'll be dealing with, can beat a general-purpose program hands-down; there are also interesting conclusions that can be drawn regarding the entropy of human languages after sorting.