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"Surely most channels allow for transmitting binary data nowadays?" Sure, but PGP is ancient. A lot of things including email and Usenet are text based. And even though FTP can of course transmit binary, you might forget to turn that option on in the text based FTP clients of that day. Note that we still have many places that require text, such as ...


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One simple steganographic technique is to just use the comment structure of a mark-up language to embed plaintext messages. For example, the html code <!-- ATTACK AT DAWN --> <img src="lolcat.jpg"> inserted in a web page and opened in a browser will render as an image (presumably of an amusing cat), but if opened in a text editor the ...


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