It sounds like they just trained a bayesian filter like langdetect to recognise simple German. A smarter training corpus would have been decrypted Enigma messag

It sounds like they just trained a bayesian filter like langdetect to recognise simple German. A smarter training corpus would have been decrypted Enigma messages! A decrypted enigma message looks like this: BOOTKLARXBEIJSCHNOORBETWAZWOSIBENXNOVXSECHSNULCBMXPROVIANTBISZWONULXDEZXBENOETIGEGLMESERYNOCHVIEFKLHRXSTEHEMARQUBRUNOBRUNFZWOFUHFXLAGWWIEJKCHAEFERJXNNTWWWFUNFYEINSFUNFMBSTEIGENDYGUTESIWXDVVVJRASCH Plaintext with word divisions, and with garbled letters corrected: BOOT KLAR X BEI J SCHNOOR J ETWA ZWO SIBEN X NOV X SECHS NUL CBM X PROVIANT BIS ZWO NUL X DEZ X BENOETIGE GLAESER Y NOCH VIER KLAR X STEHE MARQU BRUNO BRUNO ZWO FUNF X LAGE WIE J SCHAEFER J X NNN WWW FUNF Y EINS FUNF MB STEIGEND Y GUTE SICHT VVV J RASCH Formatted German plaintext: Boot klar. Bei “Schnoor” etwa 27. Nov. 60 cbm. Proviant bis 20 Dez. Benötige Gläser, noch 4 klar. Stehe Marqu. BB 25. Lage wie “Schaefer”. NW 5, 15 mb steigend, gute Sicht. Von “Rasch”. English translation (words in square brackets added to make the meaning more clear): Boat clear. [Will rendezvous] at Schnoor about 27 November. 60 cubic meters [fuel oil remaining], provisions [sufficient] until 20 December. Need binoculars; [only] four now serviceable. Am at naval square BB 25. Situation like Schaefer’s. [Wind] northwest [force] 5, [atmospheric pressure] 15 millibars rising, good visibility. From Rasch.