f116v is a decryption attempt?

[LiviuV]

Vol 3 of Trithemius' Steganographia is a 500 years old example of deniable encryption, and a very good one, only broken in the 1990s. For 500 years the prevailing opinion was that the decoy covertext is the only message.

True, and I suppose you could argue that any biliteral cipher is also an example of this.