Referencias:

[Simmons1983] G. J. Simmons. “The prisoner’s problem and the subliminal channel”. In D. Chaum, editor, Advances in Criptology, CRYPTO 83, pages 51-67, Santa Barbara, CA, August 22-24, 1983. New York: Plenum Press.

[Trithemius1499] Johannes Trithemius. “La Esteganografía”. Editorial Tritemio. 2015. Colección Tradición Perenne. ISBN-10: 8493587109. ISBN-13: 978-8493587109.

[Trithemius1499archive] Johannes Trithemius. “Steganographia”. Scans from die Bayerische Staatsbibliothek via Google, written 1499; published 1606.