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Penetration Testing: Re: blind demodulation - sound card - lucent winmodem

Re: blind demodulation - sound card - lucent winmodem

From: Evrim ULU <evrim_at_envy.com.tr>
Date: Mon, 01 Jul 2002 09:47:47 +0300

Brass, Phil (ISS Atlanta) wrote:
> not mistaken, the sound card can sample 44khz 8bits per sample 2 channels,
> typically, so it actually does roughly 700kbits per second sampling.
> However, all these extra bits won't help you reconstruct the stream if the
> carrier frequency or whatever of the data stream is faster than 44khz. Even
> if the information content is less, if you are sampling too slowly, no
> matter how precisely, you will not be able to reconstruct the stream.
>

I don't know why you are stuck with the sound card properties. But good news are
here: I've looked for national.com after your message and for only $10, i've
found adc08200 which is an 8 bit adc and has a 200 MSPS (mega samples per
second) sampling rate. $10 is very cheap so, we are not stuck with the 44khz
sound card.

> Secondly, the FBI has got "data tap" (modem-deciphering) devices, starting
> in 1995: http://www.nctp.org/docs/nwsltr9912/9912p02.html.

I think, they've already done all the things that i'm gonna do in next 10 years
but this won't stop me ehe:-)

> Perhaps you could get in touch with agent Michael Morris and find out how
> his equipment works, or whom he bought it from?

Heh, i don't think agents are going to like me.

-- 
Evrim ULU
evrim_at_envy.com.tr / evrim_at_core.gen.tr
sysadm
http://www.core.gen.tr
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Received on Jul 02 2002
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