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A comment on Discret 11, the French TV encryption of the 80s. Parent comment

Re:Discret 11, the French TV encryption of the 80s by blincoln on Monday June 08, 2020 @11:42AM (#23457534)
If it was decoding a broadcast signal, how could the unique serial number of an individual decoder play any useful part in the decryption key? I didn't see any discussion of this in the article. Sorry if I missed it.
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Re:Discret 11, the French TV encryption of the 80s by LeoPanthera on Monday June 08, 2020 @12:11PM (#23457847)
That months encryption key was "encrypted" with your serial number, and then mailed to you. You typed it into your box, and the box would decrypt it - knowing its own serial number - and then use the result.

This prevented you from copying your neighbors codes, they wouldn't work.

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