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=== Grille cypher === | === Grille cypher === | ||
A [ | A [[wikipedia:grille (cryptography)|grille]] is a 500 year old method for encrypting messages. | ||
[[File:Grille.png|none|500px|frameless | [[File:Grille.png|none|500px|frameless|The application of a grille cypher]] | ||
<p> | <p> | ||
Represent both the grid of letters and the grille as character matrices. | Represent both the grid of letters and the grille as character matrices. | ||
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</source> | </source> | ||
{{APL | {{APL development}} |