Abstract
This paper describes interactive tools for exploring the ciphers in Johannes Trithemius’ Steganographia (1500).
These tools have been implemented on the website Trithemius Redivivus (http://trithemius.com) and provide
capabilities to (1) apply Trithemius’ cryptographic techniques on any text, (2) display letter-frequency histograms of
the output, and (3) rank the outputs according to their relative entropy, computed with respect to a reference text.
