Comments on: Secret Documents Sent by Radio http://blog.modernmechanix.com/2008/05/12/secret-documents-sent-by-radio/ Yesterday's tomorrow, today. Thu, 21 Aug 2008 20:51:00 +0000 http://wordpress.org/?v=2.6 By: g662 http://blog.modernmechanix.com/2008/05/12/secret-documents-sent-by-radio/#comment-1057151 g662 Fri, 20 Jun 2008 12:49:31 +0000 http://blog.modernmechanix.com/?p=4444#comment-1057151 If the system was digital (which it probably was not) and the key sheets were for one-time use only, the system would be absolutely secure. An analog system with a key sheet that was reused would of course be "only mildly secure" as you say. I see enough non-random distribution of points on the image to the furthest right, to suggest that this was how it operated. It would be interesting to see one of these in action though. I wonder if the NSA museum has one? If the system was digital (which it probably was not) and the key sheets were for one-time use only, the system would be absolutely secure.

An analog system with a key sheet that was reused would of course be “only mildly secure” as you say. I see enough non-random distribution of points on the image to the furthest right, to suggest that this was how it operated.

It would be interesting to see one of these in action though. I wonder if the NSA museum has one?

]]> By: Casandro http://blog.modernmechanix.com/2008/05/12/secret-documents-sent-by-radio/#comment-1054782 Casandro Tue, 13 May 2008 06:33:30 +0000 http://blog.modernmechanix.com/?p=4444#comment-1054782 I'd guess he had a second scanner on both sides which scanned in the "key sheet" which will be XORed with the transmitted image. If everything is perfectly in sync, that would give a mildly secure system. I’d guess he had a second scanner on both sides which scanned in the “key sheet” which will be XORed with the transmitted image. If everything is perfectly in sync, that would give a mildly secure system.

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