Cardan Grille: Renaissance-Era Steganography
2025-01-29
The Cardan grille is an ancient method of steganography that uses a perforated grid to hide secret messages within ordinary letters. In the Renaissance, Girolamo Cardano devised a simple grid where messages were written through the holes. The grid was then removed, and the remaining spaces filled to create an innocuous-looking letter. While slow and requiring skill, this cleverly concealed messages within plain text, evading direct cryptanalysis. Though largely obsolete by the late 17th century, the Cardan grille remains a fascinating historical example of steganography.
Misc
steganography