Cipher Mysteries

I've had a few recent emails from historical code-breaker Tony Gaffney concerning the Voynich Manuscript, to say that he has been hard at work examining whether Voynichese might in fact be an example of an early Baconian biliteral cipher. This is a method Francis Bacon invented of hiding messages inside other messages, by (say) choosing between two typefaces on a letter-by-letter basis - that is, ...

Having just bought a print-on-demand copy of John Wilkins' book "Mathematical Magick: Or The Wonders That may be Performed by Mechanical Geometry", I found that it was (mostly) placed online in 2006 as part of "The Mathematical and Philosophical Works of the Right Rev. John Wilkins", (re-)published in 1802 - there's a free version on Google Books, available ...