This new, one-of-a-kind volume contains original essays, historical and technical papers, and translations of historical materials and retrospectives concerning the German Enigma Cipher machine. You get a comprehensive view of the Enigma machine’s development, uses, role in WWII Allied intelligence, and cryptanalysis. From “The Commercial Enigma: Beginnings of Machine Cryptography” and “An Enigma Chronology” to “The Road to German Diplomatic Ciphers – 1941 –1945” and “The Geheimschreiber”, all the papers in this volume are reprints of classic articles that originally appeared in the pages of the distinguished journal, CRYPTOLOGIA. Moreover, the book contains over 100 technical reviews of materials related to Enigma ‑ materials that have led in the exposure of Enigma related issues over the 28 years of the journal’s publication.