At 11:34 AM 12/3/2002 -0800, you wrote:

At 12:54 PM 12/3/02 -0500, Sunder wrote:

...

To fix this, change your MAC address (or whatever WiFi uses for that), randomly every time you move around, and don't share things that can identify your machine. i.e don't run things such as SMTP, FTP, Microsoft File sharing which give away your host name, and don't accept cookies from web sites that can track you, and make sure your browser doesn't leak your email address, and be aware that anything you do can be sniffed.

Hope that identifying 802.11 transmitters from their analog artifactual properties [1] is more difficult than identifying a Morse Coder's fist.

The technology to identify transmitters from the "keying" characteristics of the transmitter was commercially made available by Corsair Communications http://www.corsair.com/ (now merged with Lightbridge) using PhonePrint technology licensed from TRW's Avionics & Surveillance Group. They claim it was successful in preventing over 250 million fraudulent cloned handset call. It appears PhonePrint is no longer being actively marketed by Lightbridge. steve