SAT-Usenet 49/97

from: owner-sat-usenet@tags1.dn.net
Date: Sat, 4 Oct 1997 09:36:44 -0400 (EDT)
SAT-Usenet 
48/97
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Subject: Beeting Videocrypt.....
From: tony@emiliene.demon.co.uk (Tony Weston)
Date: Tue, 30 September 1997 01:08 PM EDT
Message-id: <34312e37.2846872@news.cableinet.net>

There was a program called 'antisky' which decoded 1 frame of
videocrypt 2 without need of codes / pic card / etc. It took , however
a couple of seconds of intense processing to work out where all of the
lines in a frame was snipped.

I have heard that the way VC works is that it feeds the smartcard with
a 32bit code, the card replys with a 8 bit 'key' that is used as a
sead to a psudo random number generator that drives the snipping of
each line. Does this mean that there are only 256 different 'random'
ways of encrypting each 4 seconds (or so) of VC?

If it is, then maybe it may be possible to workout this 8bit code from
the first few lines of the first frame of the set of 100 frames
encoded with the code.  This code could then be used to decript the
rest in real time.

In practise, there could be a satelite receiver connected to a High
spec PC with a video digitizer card, connected to a videocrypt
decoder....The Video signal from the receiver would have to be
buffered in the pc for a few seconds before being pushed out to the
decoder, do give the PC time for it to work out the '8' bit key -
which it then passes to the VC decoder.

Is this possible?






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Subject: Re: Beeting Videocrypt.....
From: bkm@bkmpc.bnsc.rl.ac.uk (Brian McIlwrath)
Date: Tue, 30 September 1997 06:00 AM EDT
Message-id: <60qik7$53u@newton.cc.rl.ac.uk>

Tony Weston (tony@emiliene.demon.co.uk) wrote:

: I have heard that the way VC works is that it feeds the smartcard with
: a 32bit code, the card replys with a 8 bit 'key' that is used as a
: sead to a psudo random number generator that drives the snipping of
: each line. Does this mean that there are only 256 different 'random'
: ways of encrypting each 4 seconds (or so) of VC?

It is an 8 BYTE key!! There are 256 cut points (8 bit video DAC) for EACH
picture LINE.






Subject: Re: Beeting Videocrypt.....
From: apr22@spejs.campus.luth.se (Joseph Szadai)
Date: Tue, 30 September 1997 07:11 AM EDT
Message-id: <60qmpg$q6h$2@news.luth.se>

there is a new type of decoder made in Hungary.
Contains some AT fast chips.
It decodes the VC I and II signal.
The basic principle is simple: decode the first 5 lines of the picture and
give the cut points
to the decoder's hash algorythm.

I don't know any more of the decoder's technical details. Nor I don't know
when will it be out on the market.
It was made in Hungary.Since it reconstructs the lines it does not depend on
any ECM and card change.
Joseph


Brian McIlwrath (bkm@bkmpc.bnsc.rl.ac.uk) wrote:
: Tony Weston (tony@emiliene.demon.co.uk) wrote:

: : I have heard that the way VC works is that it feeds the smartcard with
: : a 32bit code, the card replys with a 8 bit 'key' that is used as a
: : sead to a psudo random number generator that drives the snipping of
: : each line. Does this mean that there are only 256 different 'random'
: : ways of encrypting each 4 seconds (or so) of VC?

: It is an 8 BYTE key!! There are 256 cut points (8 bit video DAC) for EACH
: picture LINE.







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