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Here's a frequency chart of the first 3 images: (23, 'comma')
(10, 'capital-i')
(8, 'slash-slash')
(7, 'divided-by')
(7, 'capital-l')
(6, 'ex')
(5, 'slash-slash-backslash-backslash')
(5, 'slash-slash-backslash')
(5, 'equals')
(3, 'plus')
(3, 'minus-dot')
(3, 'equivalent')
(3, '11-over-1')
(2, 'zee')
(2, 'vertical-line')
(2, 'three-peaks')
(2, 'slash-backslash-backslash')
(2, 'slash')
(2, 's-tac-toe')
(2, 'minus')
(2, 'lower-j')
(2, 'leaning-heart')
(2, 'c-slash-slash')
(1, 'y-slash-slash')
(1, 'upsidedown-t')
(1, 'u-bar')
(1, 'three-horizontal-two-vertical')
(1, 'squared-capital-n')
(1, 'square-c')
(1, 'slash-i')
(1, 'seven')
(1, 'script-s')
(1, 'script-j')
(1, 'plus-dot')
(1, 'parallel-lines')
(1, 'minus-lower-dot')
(1, 'lower-d')
(1, 'l-on-l')
(1, 'l-in-l')
(1, 'j')
(1, 'gamma')
(1, 'four')
(1, 'equals-slash')
(1, 'crap')
(1, 'close-bracket')
(1, 'capital-z')
(1, 'capital-t')
(1, 'capital-m')
(1, 'capital-f')
(1, 'capital-b')
(1, 'capital-a')
(1, 'c-omega')
(1, 'backslash')
(1, '1-slash-1') |
The comma symbol is more frequent than any letter usually is in English, but given the small corpus that's not too telling. It could stand for an 'e', or the coded text could be lists and they're just commas.
Someone commented on the article that he suspects the 'divided by' symbol might stand for 'i' due to its placement, which agrees roughly with the position it gets in the frequency table. Someone else has suggested that the language being masked might not be english, which is an intriguing possibility.
The frequencies aren't flat, which seems to suggest it's either not a very good homophonic cipher (he just threw some odd replacments and codeword-symbols in there, basically still a substitution cipher) or it's a very good one (he consciously aimed at misleading symbol frequencies).
The rough nature of the writing (also discussed on the article) suggests that the code was probably memorised, and thus not the result of a very laborous method.