Nigel Jones

From slaves’ rectums to porn vids, there are few places people haven’t tried to conceal secret messages

A review of Prisoners, Lovers and Spies: The Story of Invisible Ink from Herodotus to al-Qa’eda, by Kristie Macrakis. The ancients hid their intel in hares' bellies; today, jihadis use porn

[Getty Images/Shutterstock/Bridgeman]

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