r hettinga rahshipwrightcom begin forwarded text deliveredto forkspamassassintaintorg forkspamassassintaintorg subject optical analog computing dave long sender forkadminxentcom date wed 02 oct 2002 110934 0700 first computer crack enigma optical computing interference patterns etc makes perfect sense enigma cracked building mechanical systems essentially enigma machines bruteforcing look zygalski sheets koerners narrative wound hybrid affair bletchley mock enigmas cycled enigmas 18k starting positions quarter hour germans started using plugboard 15x1014 possibilities poles noticed patterns messages possible via certain plugboard settings collected several cards corresponding different initial signals place pile squares corresponding daily settings aligned shine light beneath pile squares let light correspond possible daily settings brute force hardware allowed precalculation optical computing devices narrowed possibilities enough brute force used daily decodes 10 may germans invaded france day accordance best cryptographic principles changed enigma procedures way 1560 zygalski sheets carefully drilled 1000 holes became much waste cardboard dave first syntheticapertureradar processor optical also easy believe given dr elachis description 1981 shuttle imaging radar received signal recorded optical film retrieved landing film processed optical correlator generate final image makes sense one wishes shift component return proportion frequency one presumably needs glorified prism alternatively signal digitized recorded board transmitted ground via digital data link case sensor flown 1984 koerner _the pleasures counting_ various aspects enigma decoding cover four chapters quote two sections one 142 beautiful polish females 143 passing torch churchills romantic soul loved excitement secrecy surrounding bletchley relished way old procedures like setting agents suborning informants sending messages written invisible ink masquerading dressingup secret transmitters examining contents wastepaper baskets turned largely cover source one might keep oldestablished business rare books going order able cover thriving trade pornography erotica looking disparate unkempt definitely unmilitary crew formed top codebreakers said added head intelligence know told leave stone unturned find necessary staff mean take literally end forwarded text r hettinga internet bearer underwriting corporation 44 farquhar street boston 02131 usa however may deserve respect usefulness antiquity predicting end world found agreeable experience edward gibbon decline fall roman empire wed 2 oct 2002 163421 0400 optical analog computing