Craig P. Bauer is a professor of mathematics at York College of Pennsylvania. He’s theeditor-in-chief of Cryptologia and was the 2011–2012 Scholar-in-Residence at the NationalSecurity Agency’s Center for Cryptologic History. He loves to carry out research, write,and lecture. His previous books are Secret History: The Story of Cryptology and Unsolved!The History and Mystery of the World’s Greatest Ciphers from Ancient Egypt to Online SecretSocieties. With the present book he stays true to his style, blending mathematics andhistory. Craig earned his Ph.D. in mathematics from North Carolina State Universityand did his undergraduate work at Franklin & Marshall College.