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Codes and Spying

Click on the Link to access the sites listed in the table below.

BackgroundComputer History Museum Link to the museum's collections page from where you can access information about the history of early computers including those used for codebreaking.
BackgroundThe Turing Digital Archive This website run by King's College Cambridge contains nearly 3,000 images of letters, photographs, newspaper articles, and unpublished papers by or about Alan Turing. The images were scanned from the collection of Turing papers held in the Archive Centre at King's College, Cambridge.
BackgroundThe Alan Turing Home Page A large website dedicated to Alan Turing provided by Andrew Hodges author of biographical work "Alan Turing: the Enigma".
Codes/CiphersBreaking Germany's Enigma CodeBBC History article by Andrew Lycett from 2011 providing an overview and further reading lists etc.
Codes/CiphersCodebreaking and Secret Weapons in World War II Article by Bill Momsen describing German cipher capability and weaknesses in usage that let to deciphering.
Codes/CiphersGerman Code Breaking of World War II Article by Arvo L Vercamer describing coding techniques and successes and failures in code breaking by various countries since before WW1.
Codes/CiphersBletchley Park Home page of the Bletchley Park National Codes Centre. Includes information about the Enigma machine, the various equipment built to decode the Enigma ciphers and a photo collection. You can even order a kit to build your own Enigma machine
Codes/CiphersCode Talkers Article from the American Indian Heritage Month entitled "An Indian Technique". I describes how the use of the Native American Indian tongue was used to assist in secure communications in both WW1 and WW2.
Codes/CiphersUS Army Signal Corps Officer Candidate School Association Review by Dr Louis Kruhr of a publication about the SIGSALY system for secret telephony used in WW2 - the first pulse code modulation (PCM) system which has paved the way for modern telephony.
Codes/CiphersVectors - Codes, Ciphers and Codebreaking Greg Goebel has put together a comprehensive history of codes and ciphers with details of codes and codebreaking from WW1, WW2 and through to the present. Warning - it is difficult to stop once you start reading this material!
Codes/CiphersHistory of GCHQ A link to a part of the GCHQ site outlining how this organisation evolved and its achievements. You can even apply for a job there from this page if you are so inclined.
Codes/CiphersCipher Machines Timeline Dirk Rijmenants has produced a helpful timeline of encoding/decoding machines covering the period from 1917 to the 1980s with photos and additional links.
Codes/CiphersCrypto Museum An online museum from the Netherlands with information and photos of 25 historical cipher machines and other information. There are also various other instruments including radios and telex machines.
Codes/CiphersW1TP Telegraph and Scientific Instrument Museums Link to a page on the w1tp website which contains a large collection of photos of various models of the Enigma machine and its successors.
IntelligenceHistory of MI5 A link to a part of the MI5 site outlining how this organisation evolved and its achievements.
IntelligenceHistory of MI6 A link to a part of the MI6 site outlining how this organisation evolved and its achievements. Unsurprisingly there is not a great deal of information here but at least it provides and overview.
IntelligenceLangeleben and the Intercept Business Reminiscences from people who worked intercepting radio traffic including an introduction to the "Y" service and its history. These units gathered the raw intercept data that was processed by cryptanalysts.