Editing Ultra (cryptography) (section)

===Overall effect on the War===
The existence of Ultra was kept secret for many years after the war.  Since the Ultra story was widely disseminated by Winterbotham in his 1974 book ''The Ultra Secret'',{{sfn|Deutsch|1977|p=1}} historians have altered the [[historiography of World War II]]. For example, [[Andrew Roberts (historian)|Andrew Roberts]], writing in the 21st century, stated of [[Bernard Montgomery|Montgomery]]'s handling of the [[Second Battle of El Alamein]], "Because he had the invaluable advantage of being able to read [Field Marshal [[Erwin Rommel]]'s] Enigma communications, Montgomery knew how short the Germans were of men, ammunition, food and above all fuel. When he put Rommel's picture up in his caravan he wanted to be seen to be almost reading his opponent's mind. In fact he was reading his mail."{{sfn|Roberts|2009|p=297}}  Over time, Ultra has become embedded in the public consciousness and Bletchley Park has become  [[Bletchley Park Museum|a significant visitor attraction]].<ref>{{cite web|url=https://www.bletchleypark.org.uk/news/v.rhtm/Bletchley_Park_welcomes_2015s_200000th_visitor-908901.html|title=Bletchley Park Welcomes 2015'S 200,000th Visitor|publisher=Bletchley Park|date=26 August 2015|access-date=25 January 2017|archive-date=2 February 2017|archive-url=https://web.archive.org/web/20170202043901/https://www.bletchleypark.org.uk/news/v.rhtm/Bletchley_Park_welcomes_2015s_200000th_visitor-908901.html|url-status=dead}}</ref>  As stated by historian Thomas Haigh, "The British code-breaking effort of the Second World War, formerly secret, is now one of the most celebrated aspects of modern British history, an inspiring story in which a free society mobilized its intellectual resources against a terrible enemy."<ref name="haigh"/>