R. B. Stout's "A Singular Discovery"

http://www.olivercowdery.com/smithhome/2000s/2001RBSt.htm

Annals of the Civil Government of the United States During Its First Century. Niles' Register, which frequently carried items on the "Doctor" referred to him as both "Mitchell" an

Ross Anderson's Home Page

https://www.cl.cam.ac.uk/archive/rja14/

in the 1990s by some governments to ban cryptography led to a surge of interest in steganography – the art of hiding messages in other messages – and then the surge of

That's everything I could find.
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