The Rohonc Code

An investigation into the history of ciphers, codebreaking, and artificial languages that focuses on the Rohonc Codex, a four-hundred-year-old manuscript written entirely in cipher.

“ The Rohonc Code is a valuable guide for how to approach an old unsolved cipher. Historians will benefit from learning some of the mathematical approaches that Láng describes, while mathematicians will benefit from Láng’s detailing of how he pursued potential historical leads.”

—Craig P. Bauer, author of Unsolved! The History and Mystery of the World’s Greatest Ciphers from Ancient Egypt to Online Secret Societies

“This is solid historical research, yet written in a style to make the reader want to read on. . . . Throughout this enthralling exploration, Láng examines the possibilities that the document might be an artificial language or a cypher or perhaps a shorthand system of some kind.”

—Marcus Williamson Fortean Times

Benedek Láng is Professor and Chair of the Department of Philosophy and History of Science at Budapest University of Technology and Economics. He is the author of Unlocked Books: Manuscripts of Learned Magic in the Medieval Libraries of Central Europe , also published by Penn State University Press.