Review of Mathematical Ciphers from Caesar to Rsa by Anne L. Young. - Chris Christensen 001 (Cryptologia, 2007)

Review of Decrypted Secrets: Methods and Maxims of Cryptology, Fourth Edition by F. L. Bauer. - Chris Christensen 001 (Cryptologia, 2007)

2008 Joint Mathematics Meetings Contributed Paper Session: Cryptology for Undergraduates. - Chris Christensen 001; Robert E. Lewand (Cryptologia, 2007)

Review of The Collective Works of Captain George P. McGinnis by George P. McGinnis. - Chris Christensen 001 (Cryptologia, 2008)

Review of How to Tell a Secret: Tips, Tricks & Techniques for Breaking Codes & Conveying Covert Information by P. J. Huff and J. G. Lewin. - Chris Christensen 001 (Cryptologia, 2008)

Review of Voices of the Code Breakers: Personal Accounts of the Secret Heroes of World War Ii by Michael Paterson. - Chris Christensen 001 (Cryptologia, 2008)

Review of A3 and His Algebra by Nancy E. Albert. - Chris Christensen 001 (Cryptologia, 2008)

Review of The History of Information Security: A Comprehensive Handbook edited by Karl de Leeuw and Jan Bergstra. - Chris Christensen 001 (Cryptologia, 2008)

Taking a Cryptology Class to Bletchley Park. - Chris Christensen 001; Suzanne E. Gladfelter (Cryptologia, 2008)

Algebraic Cryptanalysis of SMS4: Gröbner Basis Attack and SAT Attack Compared. - Jeremy Erickson; Jintai Ding; Chris Christensen 001 (ICISC, 2009)

Review of Modern Cryptanalysis: Techniques for Advanced Code Breaking by Christopher Swenson. - Chris Christensen 001 (Cryptologia, 2009)

Review of An Introduction to Mathematical Cryptography by Hoffstein, Pipher, and Silverman. - Chris Christensen 001 (Cryptologia, 2009)

Reviews of Two Post-Quantum Cryptography Books. - Chris Christensen 001 (Cryptologia, 2009)

Review of The Shadow Factory: The Ultra-Secret NSA from 9/11 to the Eavesdropping on America by James Bamford. - Chris Christensen 001 (Cryptologia, 2009)

Review of Random Curves by Neal Koblitz. - Chris Christensen 001 (Cryptologia, 2009)

Review of Ultra Versus U-Boats: Enigma Decrypts in The National Archives by Roy Conyers Nesbit. - Chris Christensen 001 (Cryptologia, 2009)

Alan Turing's First Cryptology Textbook and Sinkov's Revision of it. - Chris Christensen 001 (Cryptologia, 2010)

Review of Bletchley Park: An Inmate's Story by James Thirsk. - Chris Christensen 001 (Cryptologia, 2010)

Review of the 2009 Cryptologic History Symposium: Global Perspectives on Cryptologic History. - Chris Christensen 001 (Cryptologia, 2010)

Review of Elementary Cryptanalysis: A Mathematical Approach, Second Edition by Abraham Sinkov, revised and updated by Todd Feil. - Chris Christensen 001 (Cryptologia, 2010)

Review of The Real Enigma Heroes by Phil Shanahan. - Chris Christensen 001 (Cryptologia, 2010)

Review of Two "Gift Books" about Cryptology. - Chris Christensen 001 (Cryptologia, 2010)

Review of Cryptography and Network Security: Principles and Practice, Fifth Edition. - Chris Christensen 001 (Cryptologia, 2011)

Review of Algebraic Cryptanalysis. - Chris Christensen 001 (Cryptologia, 2011)

Review of Understanding Cryptography. - Chris Christensen 001 (Cryptologia, 2011)

Review of The Secret Life of Bletchley Park: The World War II Codebreaking Centre and the Men and Women Who Were There. - Chris Christensen 001 (Cryptologia, 2011)

Review of Bletchley Park Trust Reports by Frank Carter. - Chris Christensen 001 (Cryptologia, 2011)

US Navy Cryptologic Mathematicians during World War II. - Chris Christensen 001 (Cryptologia, 2011)

William Dean Wray (1910-1962) the Evolution of a Cryptanalyst. - Chris Christensen 001; David Agard (Cryptologia, 2011)

Review of The Theory That Would Not Die by Sharon McGrayne. - David Agard; Chris Christensen 001 (Cryptologia, 2012)

Review of the 2011 Cryptologic History Symposium Cryptology in War and Peace: Crisis Points in History. - Chris Christensen 001 (Cryptologia, 2012)

Review of Secret Days: Code-Breaking in Bletchley Park by Asa Briggs. - Chris Christensen 001 (Cryptologia, 2012)

Review of Neil Webster's Cribs for Victory edited by Joss Pearson. - Chris Christensen 001 (Cryptologia, 2012)

Review of In the Shadow of Pont du Gard: The Polish Enigma in Vichy France (June 1940 to November 1942) by Zdzislaw J. Kapera. - Chris Christensen 001 (Cryptologia, 2012)

Review of Inside Enigma: The Secrets of the Enigma Machine and Other Historic Cipher Machines by Tom Perera. - Chris Christensen 001 (Cryptologia, 2012)

Review of The Information: A History, A Theory, A Flood by James Gleick. - Chris Christensen 001 (Cryptologia, 2012)

Lester Hill's Error-Detecting Codes. - Chris Christensen 001; David Joyner; Jenna Torres (Cryptologia, 2012)

Review of Secret Postings: Bletchley Park to the Pentagon by Charlott WebbBook Tower Publishing, Redditch, Worcestershire, UK, 2011, 72 pages, Paperback, £6.99. ISBN 978-0-9557164-1-6. - Chris Christensen 001 (Cryptologia, 2013)

Review of Introduction to Cryptography with Mathematical Foundations and Computer Implementation by Alexander StanoyevitchChapman and Hall/CRC, Boca Raton, FL, 2010, 699 pages, Hardcover, $89.95. ISBN 1439817634. - Chris Christensen 001 (Cryptologia, 2013)

Announcement of the 2013 Cryptologic History Symposium "Technological Change and Cryptology: Meeting the Historical Challenges" 17-18 October 2013. - Chris Christensen 001 (Cryptologia, 2013)

Review of Memories of My Work at the Cipher Bureau of the General Staff Second Department 1930-1945 by Marian Rejewski. - Chris Christensen 001 (Cryptologia, 2013)

Review of Decoding Organization: Bletchley Park, Codebreaking and Organization Studies by Christopher Grey. - Chris Christensen 001 (Cryptologia, 2013)

Review of Code Talker by C. Nez (with J. S. Avila). - Chris Christensen 001 (Cryptologia, 2013)

Review of Two Software-Based Textbooks. - Chris Christensen 001 (Cryptologia, 2013)

Review of Biographies of Alan Turing. - Chris Christensen 001 (Cryptologia, 2013)

The National Cash Register Company Additive Recovery Machine. - Chris Christensen 001 (Cryptologia, 2014)

Review of Secret History: The Story of Cryptology by Craig P. Bauer. - Chris Christensen 001 (Cryptologia, 2014)

Review of the 2013 Cryptologic History Symposium, Technological Change and Cryptology: Meeting the Historical Challenge. - Chris Christensen 001 (Cryptologia, 2014)

Review of A Brief History of Cryptology and Cryptographic Algorithms by John F. Dooley. - Chris Christensen 001 (Cryptologia, 2014)

Review of The History of Traffic Analysis: World War I - Vietnam by Donald A. Borrmann et al. - Chris Christensen 001 (Cryptologia, 2014)

Review of Bletchley Park: The Code-Breakers of Station X by Michael Smith. - Chris Christensen 001 (Cryptologia, 2014)

Lester Hill Revisited. - Chris Christensen 001 (Cryptologia, 2014)

Review of The Lost World of Bletchley Park by Sinclair Mckay. - Chris Christensen 001 (Cryptologia, 2015)

Review of IEEE Milestone Award to the Polish Cipher Bureau for "The First Breaking of Enigma Code". - Chris Christensen 001 (Cryptologia, 2015)

Review of Marian Rejewski: The Man Who Defeated Enigma by Zdzisław J. Kapera. - Chris Christensen 001 (Cryptologia, 2015)

Review of Alan Turing: His Work and Impact Edited by S. Barry Cooper and Jan van Leeuwen. - Chris Christensen 001 (Cryptologia, 2015)

Review of Blackett's War by Stephen Budiansky. - Chris Christensen 001 (Cryptologia, 2015)

Review of Act of War: Lyndon Johnson, North Korea, and the Capture of the Spy Ship Pueblo by Jack Cheevers. - Chris Christensen 001 (Cryptologia, 2015)

Review of The Riddle of the Labyrinth by Margalit Fox. - Chris Christensen 001 (Cryptologia, 2015)

The Story of Mamba: Aligning Messages Against Recovered Additives. - Chris Christensen 001; Jared Antrobus (Cryptologia, 2015)

A review of three books about the women of Bletchley Park. - Chris Christensen 001 (Cryptologia, 2016)

Companion review of Prof: Alan Turing Decoded by Dermot Turing. - Chris Christensen 001 (Cryptologia, 2016)

Review of Codes, Ciphers and Spies: Tales of Military Intelligence in World War I by John F. Dooley. - Chris Christensen 001 (Cryptologia, 2016)

Review of U.S. Navy Codebreakers, Linguists, and Intelligence Officers against Japan, 1910-1941 by Steven E. Maffeo. - Chris Christensen 001 (Cryptologia, 2016)

Review of The SIGABA/ECM II Cipher Machine: "A Beautiful Idea" by Timothy J. Mucklow. - Chris Christensen 001 (Cryptologia, 2017)

Review of The Neglected Giant: Agnes Meyer Driscoll by K. Johnson. - Chris Christensen 001 (Cryptologia, 2017)

Review of An Introduction to Number Theory with Cryptography by James S. Kraft and Lawrence Washington. - Chris Christensen 001 (Cryptologia, 2017)

Review of The Imitation Game. - Chris Christensen 001 (Cryptologia, 2017)

Review of Demystifying the Bombe by Dermot Turing. - Chris Christensen 001 (Cryptologia, 2017)

Review of The Mathematics of Encryption: An Elementary Introduction by M. Cozzens and S. Miller. - Chris Christensen 001 (Cryptologia, 2017)

A comment on a book review. - Chris Christensen 001 (Cryptologia, 2017)

Review of The Triumph of Zygalski's Sheets: The Polish Enigma in the Early 1940 by Zdzisław J. Kapera. - Chris Christensen 001 (Cryptologia, 2017)

Review of SIGINT: The Secret History of Signals Intelligence 1914-1945 by Peter Matthews. - Chris Christensen 001 (Cryptologia, 2017)

Review of Bletchley Park: The Secret Archives by Sinclair McKay. - Chris Christensen 001 (Cryptologia, 2017)

The evolving relationship between mathematics and cryptology, 1951-1952: SCAG and the beginnings of SCAMP and NSASAB. - Chris Christensen 001 (Cryptologia, 2017)

Review of Silence Means Security: Secrets of a WWII Code-Breaking WAC by B. Nicodemus. - Chris Christensen 001 (Cryptologia, 2017)

Review of Code Warriors: NSA's Codebreakers and the Secret Intelligence War against the Soviet Union by S. Budiansky. - Chris Christensen 001 (Cryptologia, 2017)

Review of Code Breaking in the Pacific by Peter Donovan and John Mack. - Chris Christensen 001 (Cryptologia, 2018)

Review of The Mathematics of Secrets by Joshua Holden. - Chris Christensen 001 (Cryptologia, 2018)

Review of The New Codebreakers edited by P. Ryan, D. Naccache, and J.-J. Quisquater. - Chris Christensen 001 (Cryptologia, 2018)

Review of Working on the Dark Side of the Moon: Life Inside the National Security Agency by Thomas Reed Willemain. - Chris Christensen 001 (Cryptologia, 2018)

Review of Lorenz and comments on the work of William Tutte. - Chris Christensen 001 (Cryptologia, 2018)

Review of A Grand Gossip: The Bletchley Park Diary of Basil Cottle edited by James and Judith Hodsdon. - Chris Christensen 001 (Cryptologia, 2018)

Review of TICOM: The Hunt for Hitler's Codebreakers by Randy Rezabek. - Chris Christensen 001 (Cryptologia, 2018)

Review of The Spy Who Couldn't Spell by Yudhijit Bhattacharjee. - Chris Christensen 001 (Cryptologia, 2019)

Review of Stanley Johnston'S Blunder: the Reporter Who Spilled the Secret Behind the U.S. Navy'S Victory at Midway by Elliot Carlson. - Chris Christensen 001 (Cryptologia, 2019)

Review of Alastair Denniston: Code-Breaking from Room 40 to Berkeley Street and the Birth of GCHQ by Joel Greenberg. - Chris Christensen 001 (Cryptologia, 2019)

Edward Hugh Simpson CB (10 December 1922 - 5 February 2019). - Chris Christensen 001 (Cryptologia, 2019)

Review of History of Cryptography and Cryptanalysis by John Dooley. - Chris Christensen 001 (Cryptologia, 2019)

Review of The Cypher Bureau by Eilidh McGinness. - Chris Christensen 001 (Cryptologia, 2019)

Review of X, Y & Z by Dermot Turing. - Chris Christensen 001 (Cryptologia, 2019)

Aligning JN-25 messages in depth using weights when the code groups scan. - Chris Christensen 001; Jared Antrobus; Edward Simpson (Cryptologia, 2019)

Review of code cracking for kids by Jean Daigneau. - Chris Christensen 001 (Cryptologia, 2020)

Review of The Enigma Bulletin edited by Zdzisław J. Kapera. - Chris Christensen 001 (Cryptologia, 2020)

Review of Bletchley Park and D-Day by David Kenyon. - Chris Christensen 001 (Cryptologia, 2020)

The Imperial Japanese Navy IKA Cipher Machine. - Chris Christensen 001 (HistoCrypt, 2021)

Review of Breaking Teleprinter Ciphers at Bletchley Park by James A. Reeds, Whitfield Diffie, and J. V. Field. - Chris Christensen 001 (Cryptologia, 2021)

Review of Operation Vengeance: The Astonishing Aerial Ambush That Changed World War II by Dan Hampton. - Chris Christensen 001 (Cryptologia, 2021)

Review of The Codebreakers of Bletchley Park by Dermot Turing. - Chris Christensen 001 (Cryptologia, 2021)

Review of A Course in Cryptography by Heiko Knospe. - Chris Christensen 001 (Cryptologia, 2021)

Review of The U.S. Navy's On-the-Roof Gang, Volume Two, War in the Pacific by Matt Zullo. - Chris Christensen 001 (Cryptologia, 2021)

Review of Codebreaking: A Practical Guide by Elonka Dunin and Klaus Schmeh. - Chris Christensen 001 (Cryptologia, 2021)

Review of The U.S. Navy's On-the-Roof Gang, Volume One, Prelude to War by Matt Zullo. - Chris Christensen 001 (Cryptologia, 2022)

Review of One Day in August by David O'Keefe. - Chris Christensen 001 (Cryptologia, 2022)

Review of Geniuses at War: Bletchley Park, Colossus, and the Dawn of the Digital Age by David A. Price. - Chris Christensen 001 (Cryptologia, 2022)

Review of Before Bletchley Park: The Codebreakers of the First World War by Paul Gannon. - Chris Christensen 001 (Cryptologia, 2022)

Review of Backing Bletchley: The Codebreaking Outstations from Eastcote to GCHQ by Ronald Koorm: Koorm, Ronald. - Chris Christensen 001 (Cryptologia, 2022)

Review of Madame X: The Story of '003', the U.S. Army Cryptologic Bombe in World War II by Michael Barbakoff. - Chris Christensen 001 (Cryptologia, 2022)

Review of Images of the National Archives Codebreakers by Stephen Twigge. - Chris Christensen 001 (Cryptologia, 2022)

Review of Reflections of Alan Turing: A Relative Story by Dermot Turing: Turing, Dermot. - Chris Christensen 001 (Cryptologia, 2022)

Review of USN & USMC WW II Cryptologists' Oral Histories; Voices from the past, Volumes 1 and 2 by U.S. Naval Cryptologic Veterans Association. - Chris Christensen 001 (Cryptologia, 2022)

Review of Radio War: The Secret Espionage War of the Radio Security Service 1938-1946 by David Abrutat: Abrutat. - Chris Christensen 001 (Cryptologia, 2022)

Review of The Bombe: The Machine that Defeated Enigma by Dermot Turing. - Chris Christensen 001 (Cryptologia, 2022)

Review of Eavesdropping on the Emperor: Interrogators and Codebreakers in Britain's War with Japan by Peter Kornicki. - Chris Christensen 001 (Cryptologia, 2022)

Review of Codebreaker Girls: A Secret Life at Bletchley Park by Jan Slimming. - Chris Christensen 001 (Cryptologia, 2023)

Review of The Rohonc Code: Tracing a Historical Riddle by Benedek Láng. - Chris Christensen 001 (Cryptologia, 2023)

Genevieve Grotjan's "great discovery". - Chris Christensen 001 (Cryptologia, 2023)

Review of Parker Hitt: The Father of American Military Cryptology by Betsy Rohaly Smoot. - Chris Christensen 001 (Cryptologia, 2023)

Review of The Secret Life of an American Codebreaker: Codebreaker Girls by Jan SlimmingSlimming, Jan. The Secret Life of an American Codebreaker: Codebreaker Girls , South Yorkshire, England: Pen and Sword Books. 2022. 289 + xii pages, Hardcover, £25 ($34.95). ISBN 9781526784155. - Chris Christensen 001 (Cryptologia, 2023)

Review of 100 People You Never Knew Were at Bletchley Park by Sinclair McKayMcKay, Sinclair. 100 People You Never Knew Were at Bletchley Park . Safe Haven Books Ltd, London, 2021. 250 pages, Hardcover, £14.99. ISBN 978-1-8384051-2-0. - Chris Christensen 001 (Cryptologia, 2024)

Review of No More Secrets: My Part in Codebreaking at Bletchley Park and the Pentagon by Betty WebbWebb, Betty. No More Secrets: My Part in codebreaking at Bletchley Park and the Pentagon, London: Mardle Books. 2023. 212+x pages, Paperback, £9.99. ISBN 9781837700219. - Chris Christensen 001 (Cryptologia, 2024)

Review of The Bletchley Park Codebreakers in their own words by Joel Greenberg. - Chris Christensen 001 (Cryptologia, 2024)

Review of The First Enigma Codebreaker: The Untold Story of Marian Rejewski Who Passed the Baton to Alan Turing: By Robert Gawłowski Translated by Agnieszka Marciniak. - Chris Christensen 001 (Cryptologia, 2024)

Review of Queen of Codes: The Secret Life of Emily Anderson, Britain's Greatest Female Codebreaker by Jackie Uí Chionna: Headline Publishing Group, London, 2023. 418 pages, Hardcover, £25.00. ISBN 978-1-4722-9547-7. - Chris Christensen 001 (Cryptologia, 2024)

The Japanese Green Machine. - Chris Christensen 001 (Cryptologia, 2024)

Review of The Real Special Relationship by Michael Smith: Smith, Michael. A Real Special Relationship: The True Story of How the British and US Secret Services Work Together. Simon & Schuster UK Ltd., London, 2023. 553 + xxii pages, Hardcover, £25.00. ISBN 9781471186790. - Chris Christensen 001 (Cryptologia, 2024)

Review of The Forgotten Giant of Bletchley Park by Harold Liberty: Liberty, Harold. Pen & Sword Books, Ltd., Yorkshire, 2022. 215 + xvi pages, Hardcover, $39.95. ISBN 978-1-39908-961-6. - Chris Christensen 001 (Cryptologia, 2025)

Review of The Hidden History of Code-Breaking and 50 Codes That Changed the World , both by Sinclair McKay: The Secret World of Cyphers, Uncrackable Codes, and Elusive Encryptions. - Chris Christensen 001 (Cryptologia, 2025)

Review of Enigma Traitors by Dermot Turing: Turing, Dermot. Enigma Traitors: The Struggle to Lose the Cipher War. Cheltenham: The History Press. 2023. 318 pages, Hardcover, $22.00. ISBN 978-1-80399-169-6. - Chris Christensen 001 (Cryptologia, 2025)