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Lecture #26:  Enigma on videotape


Mr. Radomirovic presided. Students were reminded about the scheduled final exam, and about their DES papers. A two-hour Nova special entitled Decoding Nazi Secrets appeared on PBS TV in the fall. Ms. Fefferman had kindly edited a tape of this show down to about 80 minutes, and her tape was shown for the balance of the class.

Mr. Radomirovic wrote:

After spending 10 minutes with administrative things and introduction to Enigma (a German cryptosystem used in WW2, broken by winners of WW2, one of the reasons why they won) we started watching the tape. Everything went fine, but since the tape is 80 minutes in length we didn't see the last 10 minutes I guess. It's the part were they start talking about the teletype system that was converted into a encrypting device. Since everybody left, I didn't watch it either, but I am wondering what happened then...
The teletype encryption device was "broken" with the help of depths, so it is unfortunate that this fact was not shown to the students!


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