RE: Tempest today

[<Bryan_McAninch () McAfee com>]

Thanks, but I don't quite see the relevance in regards to CRT-based EMR
eavesdropping. The title of the patent application (#2476337) is "Secret
Radio Communication"; in the second paragraph Varian states "An object
of my invention is to provide secrecy in communication, with methods and
apparatus for enabling only authorized listeners to receive either
telephone or telegraphic communications."

Reference: 

http://patimg1.uspto.gov/.piw?docid=US002476337&SectionNum=1&IDKey=1F68D
9BEF656&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1%252
6Sect2=HITOFF%2526d=PALL%2526p=1%2526u=%25252Fnetahtml%25252FPTO%25252Fs
rchnum.htm%2526r=1%2526f=G%2526l=50%2526s1=2476337.PN.%2526OS=PN/2476337
%2526RS=PN/2476337

-----Original Message-----
From: J. Oquendo [mailto:sil () infiltrated net] 
Sent: Monday, August 21, 2006 12:57 PM
To: McAninch, Bryan
Cc: full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] Tempest today

Bryan_McAninch () McAfee com wrote:
> Interesting link, thanks. :)
>
> Perhaps Van Eck was the first to research EMR eavesdropping of CRT
> screens... ?
>   
Nope:

Abstract:       A system for preventing the remote detection and
decoding of computer data from RF or conducted signal emissions is
disclosed. A simulator is coupled to the computer for emulating signal
emissions in order to mask the computer signal emissions. The simulator
includes an emulation generator coupled to the computer to radiate
signals that fully emulate those radiated by the computer to be
protected. The emulated signal emissions are synchronized with the
computer signal emissions by a special control unit which receives
timing instructions from the computer. A random sequence generator
randomizes and convolutes the sequence of the emulated signal emissions
so that the composite signal emissions formed by the computer and the
simulator cannot be decoded to render meaningful data indicative of that
being processed by the computer. The simulator is coupled with a
computer to be protected by connection to the I/O interface port of the
computer.
        

US Patent References:   
2476337 Jul., 1949      Varian.

Go to www.uspto.gov and do a patent search. You will see an image
explaining this from 1949. Wim Van Eck probably wasn't even in diapers
then.


====================================================
J. Oquendo
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743
sil . infiltrated @ net http://www.infiltrated.net 

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