|Cardan Grille Cipher|
The Cardan Grille Cipher was first proposed by Girolamo Cardano in 1550. He would hide a message within a letter. A cardboard or paper template would have holes cut into it. When this template was placed on top of a written page, certain letters would show through the holes revealing the message. Variations include using a printed book page or a jumble of letters.
The Irish Republican Brotherhood used a Cardan Grille Cipher in their plot to kidnap Prince Alfred when His Highness visited Toronto. Detective William Murdoch was able to decipher it. The template was placed on a Bible page ("The Prince and the Rebel").
|Murdoch Mysteries Seasons|
|Season 1 • Season 2 • Season 3 • Season 4 • Season 5 • Season 6 • Season 7 • Season 8 • Season 9 • Season 10 • Season 11 • Season 12 • Season 13 • Season 14|