Detection of Messages
When executed badly, a Cardan message stands out because of stilted language and uneven writing. An analyst may attempt to reconstruct the grille when there are several examples of suspect messages from a correspondent.
When executed well, a Cardan message can be difficult to spot. Even when an analyst suspects the presence of a message, an innocent letter can contain apparently hidden text. So, in practice, the only solution is to obtain the grille itself.
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Famous quotes containing the word messages:
“Joan: I hear voices telling me what to do. They come from God. Robert: They come from your imagination. Joan: Of course. That is how the messages of God come to us.”
—George Bernard Shaw (1856–1950)