Hiding secrets in online text with zero-width characters
by Cory Doctorow from on (#4S98Z)
Unicode includes six "zero-width characters" that are not visibly rendered in browsers (U+FEFF, U+200C, U+200D, U+200E, U+2060, U+180E) -- they're used for some specialized cases in rendering non-Roman alphabets.
Inzerosight's browser extension allows you to insert and detect hidden messages encoded in zero-width characters; absent the plugin or a source-code inspection, these do not show up at all, not even when the text is highlighted.
""""aa"a""""a""""a"a""a"aa"aaa""""""aa"""a""aa""""""a"""""""a"a""
I may or may not have included some of this text in this post.
inisight [Planetrenox]
(via Hackaday)