Cardan grille

The Cardan grille is a method of writing secret messages using a grid.

In 1550, Girolamo Cardano (1501-1576), known in French as Jérôme Cardan, proposed a simple grid for writing hidden messages. He intended to cloak his messages inside an ordinary letter so that the whole would not appear to be a cipher at all.

单词	Cardan grilles
释义	Cardan grilles 英语百科 Cardan grille The Cardan grille is a method of writing secret messages using a grid. In 1550, Girolamo Cardano (1501-1576), known in French as Jérôme Cardan, proposed a simple grid for writing hidden messages. He intended to cloak his messages inside an ordinary letter so that the whole would not appear to be a cipher at all.
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Cardan grilles

Cardan grille