If you ever overhear people's conversations and wonder what on Earth they're talking about, a new book may offer a lifeline. Described as 'a miscellany of secret languages', Schott's Significa by Ben ...

The room we are in is locked. It is windowless and lit from above by a fluorescent bulb. In the hallway outside—two stories beneath the city of London—attendants in dark suits patrol silently, giving ...

A newly invented cipher may shed light on how the mysterious Voynich manuscript was made in medieval times. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...

During the Cold War, numbers stations became prolific as high-security, low-risk spy tools to send secret messages to operatives in the field. However, as early as World War I, espionage agencies were ...

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