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philh comments on Open thread, Apr. 01 - Apr. 05, 2015 - Less Wrong Discussion
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If cyphertext in image metadata would be acceptably well-hidden, this should be as well: you can hide four bits per pixel using the least significant bits of the RGBA channels. A human won't be able to tell the difference between #FE007BFE and #FF017AFF.
(This assumes .png. I don't think it would work very well, if at all, for either jpeg or gif.)