RE : Without Wires

["Marc OLANIE" <Marc.OLANIE () decision fr>]

> i've read all sorts of crap about direction finding of
> Wifi targets from people who dont know what they are talking about including
 
Beeing a specialized "non specialist", I feel I can answer this kind of question.
 
RF direction finding (aka goniometry or RDF for Radio Direction Finding) is a sport invented circa 1930 (well, I mean 
the "serious" way to do it) by a french ingeneer called Robert Deloraine, inventor of the "instant goniometer" 
(location of german subs in mediteranean see befor WW2). Deloraine ended his carreer sadly as general manager of ITT. 
 
Instant direction finding is able, with very simple trigonometry knowledge and a simple couple of switched antenna 
network, to locate the exact position of a transmitter in less than 1/10 of a second, and with a investment under 50 $. 
And without any plane or balloon.or other exotic practices. Switched antenna network used for direction finding are 
based on the same principle that some moderne WiFi access point with "optimized radiation patern"
 
It's even easier on 2.4 GHz. The higher the frequency is, the quicker and more precise is the location (as you can 
consider that over 100 MHz, all transmission are using a quasi -optical path... or sort of).
The only problem could be the number of Wifi signals in a suburban area, and the discrimination of the source amongst 
hundreds or thousands. But "software defined radio" systems are able to solve this question. When your are analyzing a 
radio signal in the "time domain" (opposed to a "frequency" domain), you will be able to differenciate the signature of 
a peculiar transmission. Developping this concept would be totally off topic, but I can swear than your can fingerprint 
a transmitter not only with his "direction" and " signal level" datas, but also with small particularities of his 
spectrum and time/spectrum signature (three letter agencies are using such an approach to discriminate VoIP 
conversations to spot the voice of a precise person)
 
Would you please excuse my poor english ad the fact that I'm definitely not a "security certified" guy.... just a 
tourist listning to Dailydave for fun and profit 
 
PS : by the way... you're right when you are saying that most of people speaking about wireless stuff is crap. RDF is 
like Wep (or WPA) cracking : few people are doing it.... far less than people who said they are able to do it.
 
Marc Olanié/f6itu
Journalist
www.cnis-mag.com <https://mail.suptel.net/exchweb/bin/redir.asp?URL=http://www.cnis-mag.com> 
A good working kernel is not supposed to crash unless it says "please"
(traduction : Da Power, Fantudjûû ! RuleZ Tartiflette !)

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