An excerpt of Henry Debosnys cipher from the 1880s. (From the Collection of the Adirondack History Museum)

Many people have taken an interest in trying to solve the cryptograms left behind by the Zodiac, puzzles that that many believe may contain his identity and other vital information about him.

Craig P. Bauer, a professor of mathematics at York College of Pennsylvania, is editor in chief of the journal Cryptologia. He has served as a scholar in residence at the NSA’s Center for Cryptologic History and is the author of Unsolved!: The History and Mystery of the World’s Greatest Ciphers from Ancient Egypt to Online Secret Societies.

Craig P. Bauer

Craig P. Bauer, a professor of mathematics at York College of Pennsylvania, is editor in chief of the journal Cryptologia. He has served as a scholar in residence at the NSA’s Center for Cryptologic History and is the author of Unsolved!: The History and Mystery of the World’s Greatest Ciphers from Ancient Egypt to Online Secret Societies.

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Crime has been a dark and powerful undercurrent in human society throughout history. Uncover the facts behind some of the most daring robberies, brazen scams and brutal murders ever committed.

Craig P. Bauer

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When Killers Leave Ciphers

The Zodiac Ciphers: What Cryptologists Know