Cardan Grille Cipher
Prince rebel grille cipher.jpg

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 1Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10Season 11Season 12Season 13Season 14
Community content is available under CC-BY-SA unless otherwise noted.