The ancient art of hidden writing

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The arrest of 10 alleged spies in the United States has thrust the ancient practice of steganography into the limelight.

Several of the suspects are accused of using the method to conceal data being transmitted from the US to Russia.

That question mark over it dates from the text in which the word was coined, Steganographia, which was written in 1499 by Johannes Trithemius but not published until 1606.

The name of the book derives from the Greek for concealed writing and steganographic techniques involve hiding messages in otherwise innocent-looking media - be that text, images or video....

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