411 REFERENCE · Wiktionary
Cardan grille
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Proposed in 1550 by Girolamo Cardano (1501-1576), known in French as Jérôme Cardan.
Noun
en cryptography A sheet of card or thin metal, etc., used in composing secret messages. The words of the message are written through a number of holes cut arbitrarily in the sheet, and the remaining paper is then filled with irrelevant words to disguise it.
en eponyms