[53013] in Cypherpunks
Re: [NOISE] Cable-TV-Piracy-Punks
daemon@ATHENA.MIT.EDU (Perry E. Metzger)
Sat Mar 30 21:23:04 1996
To: mpd@netcom.com (Mike Duvos)
Cc: cypherpunks@toad.com
In-Reply-To: Your message of "Sat, 30 Mar 1996 15:51:04 PST."
<199603302351.PAA03993@netcom14.netcom.com>
Reply-To: perry@piermont.com
Date: Sat, 30 Mar 1996 19:21:39 -0500
From: "Perry E. Metzger" <perry@piermont.com>
Mike Duvos writes:
> In the system I described, a person might make a lower bandwidth
> attempt to defeat the system by leaking either the periodically
> changing random session key used to encrypt the video stream, or
> the unique cryptographic key belonging to a particular smart card
> authorized to view the program. We have postulated that the
> latter is not recoverable even by destructive reverse engineering
> of a specific card,
Why not? If the card knows its own key, then someone else can probably
get the key out by some nasty mechanism.
.pm
