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I have a friend who used to get erotic messages from her mathematician boyfriend steganographically encrypted on postcards. I had to show her how to decrypt them. It was pretty standard cryptanalysis once I guessed that the messages existed. Some of them were filthy.

Stenographically encrypted in the printed image? How would that work?

Probably on the side you write on.

Yep, that would make far more sense... For some reason I assumed it was an image encoded on the postcard. Rereading the original post, that's not what it says, is it...

Your post seems to miss the fact that the mail, phone calls and popular chat services are already logged, and asking for encryption back-doors is just wanting that process to continue.

Mail may be logged, but they're certainly not opening most envelopes to read their contents.

Postcard steganography. Would be downright devious.