In cryptography, a Cardan grille is an important tool in the reading of a message obfuscated through steganography. Introduced in 1550 by Renaissance mathematician Gerolamo Cardano (also known as Jerome Cardan), the grille is usually a card perforated with holes at selected places. To decrypt a message, the card is laid over the page of text that contains a hidden message, reading only the letters that appear through the holes in the grille. Cryptography has had a long and colourful history. ... Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message; this is in contrast to cryptography, where the existence of the message is clear, but the meaning is obscured. ... Events February 7 - Julius III becomes Pope. ... Gerolamo Cardano or Jerome Cardan or Girolamo Cardan (September 24, 1501 - September 21, 1576) was a celebrated Italian Renaissance mathematician, physician, astrologer, and gambler. ...
>Cardangrille is a seismographical method that brakes the mutual bonds and deforms the >statistics.
The grill is then used such way that we write plaintext into the openings (in >forward or backward direction).
I found, among others: "http://en.wikipedia.org/wiki/Cardan_grille" which said: "In cryptography, a Cardangrille (introduced by Renaissance mathematician Gerolamo Cardano, also known as Jerome Cardan, in 1550) is an important tool in the reading of a message obfuscated through steganography.
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