Re: blind demodulation - sound card - lucent winmodem

[Evrim ULU <evrim () envy com tr>]

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 () envy com tr / evrim () core gen tr
sysadm
http://www.core.gen.tr


----------------------------------------------------------------------------
This list is provided by the SecurityFocus Security Intelligence Alert (SIA)
Service. For more information on SecurityFocus' SIA service which
automatically alerts you to the latest security vulnerabilities please see:
https://alerts.securityfocus.com/