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The United States National Security Agency—the country's premier signals intelligence organization—recently declassified a Cold War-era document about code-breaking. The first two parts of the trilogy ...

A French amateur codebreaker claims to have done what police and other investigators could not: Solve the remaining Zodiac Killer ciphers, including one that supposedly reveals the California killer’s ...

The expert cryptanalyst and the Sunday-puzzle expert alike rely on the fact that letters have their own personalities. As David Kahn writes: “To the casual observer, they may look as alike as troops ...

This week in the magazine, Jill Lepore considers some of the more fascinating aspects of Edgar Allan Poe’s character, like his penchant for puzzles. Here, she offers our readers a chance to take on ...