In alphabetical order, we want to express special thanks to Tyler Akins, Bill Briere, Magnus Ekhall, Thomas Ernst, Bernhard Esslinger, Zachary Epstein, Dan Fretwell; Lawrence McElhiney, Dave Oranchak, Tobias Schrödel, Dale Sibborn, Gerhard Strasser, Erica Swearingen, and Satoshi Tomokiyo for their enthusiastic and comprehensive proofreading.

We would also like to thank John Allman; Christiane Angermayr; Lucia Angermayr; Nicolay Anitchkin; Eugen Antal; Philip Aston; Leopold Auer; Paul Barron; Max Bärtl; Craig Bauer; Christian Baumann; Richard Bean; Stefan Beck; Arianna Benini; Neal Bennett; Yudhijit Bhattacharjee; Bob Bogart; Kent D. Boklan; Paolo Bonavoglia; Raymond Borges; Thomas Bosbach; Gert Brantner; Jew-Lee Lann-Briere; Norbert Biermann; Dan Brown (yes, *the* Dan Brown!); Ralf Bülow; Chris Christensen; Frank Corr; Nicolas Courtois; Carola Dahlke; Jason Davidson; Melissa Davis; Whitfield Diffie; Jörg Drobick; Stanley Dunin; Ralph Erskine; Jarl Van Eycke; Jason Fagone; Cheri Farnsworth; Heathyr Fields; Frank Förster; Tony Gaffney; Jim Gandy; Joachim von zur Gathen; Jim Gillogly; Dan Girard; Nicole Glücklich; Frank Gnegel; Marek Grajek; Jackie Griffith; Marc Gutgesell; Sandi Hackney; Karsten Hansky; Louie Helm; Lonnie Henderson; Jürgen Hermes; Michael Hörenberg; Günter Hütter; Ralf Jäger; JannaK; David Kahn; Bryan Kesselman; Manfred Kienzle; Teresa Kuhl; Gary Klivans; Joe Loera; Oliver Knörzer; Daniel Kolb; Anatoly Kolker; Klaus Kopacz; Nils Kopal; Armin Krauß; Benedek Láng; George Lasry; Karl de Leeuw; Jon, Beth, Peter, and Amber Leonard; Peter Lichtenberger; Krista van Loon; Tom Mahon; Denny McDaniels; John McVey; Hans van der Meer; Beáta Megyesi; Glen Miranker; Didier Müller; Wolfgang Müller; Walter C. Newman; Jim Oram; Olaf Ostwald; Nick Pelling; Klaus Pommerening; Duncan Proudfoot; Katja Rasch; Jim Reeds; Paul Reuvers; Dirk Rijmenants; Sara Rivers-Cofield; Richard SantaColoma; Volker Schmeh; Wolfgang Schmidt; Leon Schulman; Linda Silverman; Marc Simons; Ralph Simpson; Rob Simpson; Dale Speirs; Rene Stein; Christoph Tenzer; Dermot Turing; Alexander Uliyanenkov; Ilona Sofia Vine; TJ Dunin Vine; Arno Wacker; Rich Wales; Frode Weierud; Meg Welch; Bart Wenmeckers; Bart Wessel; David Allen Wilson; Richard van de Wouw; Ruth Wüst; Gordon Young; DeEva Zabylivich; René Zandbergen; and Philip Zimmermann for their contributions, either to the book, or to relevant discussions.

In addition, we appreciate the support of the Aargau Cantonal Library in Switzerland; the American Cryptogram Association; the Beale’s Beer restaurant; the dCode group; the George C. Marshall Foundation (Lexington, VA); the Deutsches Museum (Munich Germany); the Franz Steiner Verlag; the Heinz Nixdorf MuseumsForum (Paderborn, Germany); the John F. Kennedy Presidential Library and Museum; the Kryptologikum (Karlsruhe, Germany); the Lehrsammlung für Nachrichten-, Fernmelde- und Informationstechnik der Bundeswehr (Feldafing, Germany); the Louis Round Wilson Special Collections Library at the University of North Carolina, Chapel Hill; the Museum für Kommunikation (Frankfurt, Germany); the National Cryptologic Museum (Fort Meade, MD);  the Niedersächsisches Landesarchiv Abteilung Wolfenbüttel; the New York State Archives; the New York State Military Museum; the Royal Collection, The Netherlands; the Schreibmaschinenmuseum Beck (Pfäffikon, Switzerland); Touchstone Films; and Walt Disney Pictures; along with all of our internet friends: blog readers, friends and participants from Facebook, Reddit, the Kryptos Group and others around the World Wide Web.