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Transposition cipher
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== Grilles == {{Main|Grille (cryptography)}} Another form of transposition cipher uses ''grilles'', or physical masks with cut-outs. This can produce a highly irregular transposition over the period specified by the size of the grille, but requires the correspondents to keep a physical key secret. Grilles were first proposed in 1550, and were still in military use for the first few months of World War One.
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