Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!att!cbnews!military From: zimerman@phoenix.princeton.edu (Jacob Ben-david Zimmerman) Newsgroups: sci.military Subject: Re: Ultra -vs- Magic Keywords: Ultra, Magic, Crypto-analysis Message-ID: <1990Oct2.234803.22706@cbnews.att.com> Date: 2 Oct 90 23:48:03 GMT References: <1990Sep27.031404.6848@cbnews.att.com> Sender: military-request@att.att.com Organization: Princeton University, Princeton, New Jersey Lines: 17 Approved: military@att.att.com From: zimerman@phoenix.princeton.edu (Jacob Ben-david Zimmerman) The difference between 'magic' and 'ultra' information in WWI is as follows: 'Magic' was the information resulting from the cracking of the Japanese Purple code and various other codes, the most important during the war being JN-25. In essence, the decoded messages themselves were 'magic' information, and were tightly guarded. 'Ultra' messages were instructions to units that were based on Magic information. The first example I can think of is that messages to U.S. Submarines on patrol ordering them to an interception arrived at by 'magic' were called 'ultra messages.' ___________ |-Here comes your father. || | -Henry V || ||acob Zimmerman!+> INTERNET === | BITnet