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The spy concealed his message by writing the instructions through the holes of a Cardan grille before passing the paper to his contact.
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The spy concealed his message by writing the instructions through the holes of a Cardan grille before passing the paper to his contact.
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Related words
Cardan grille
Noun
Japanese Meaning
暗号技法の一種で、カードや薄い金属の板などに適当な位置に穴を開け、その穴を通して秘密のメッセージを記述し、残りの部分を意味のない語で埋めることで、メッセージを隠蔽する手法
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