At 3:08 PM -0700 4/21/98, Phil Karn wrote:
I expect the main countermeasure to cellular position tracking will be the use of one-way pagers. Keep your cell phone turned off, and if you get a page when you're someplace you don't want them to know, wait until you leave before you return the page.
Perhaps if the "just turn it off" approach is widely promoted, the carriers and vendors will see the threat to their business and press for some safeguards. Otherwise they just won't give a damn.
Another, more sophisticated measure is to replace the omni with a directional antenna (corner reflectors are pretty small at analog cellular frequencies and above and can have excellent gain and front-to-back ratios). The disparity of your received signal between different cell sites, plus the near-far problem for CDMA systems, could make accurate location much more difficult. --Steve PGP mail preferred, see http://www.pgp.com and http://web.mit.edu/network/pgp.html RSA fingerprint: FE90 1A95 9DEA 8D61 812E CCA9 A44A FBA9 RSA key: http://keys.pgp.com:11371/pks/lookup?op=index&search=0x55C78B0D --------------------------------------------------------------------- Steve Schear | tel: (702) 658-2654 CEO | fax: (702) 658-2673 Lammar Laboratories | 7075 West Gowan Road | Suite 2148 | Las Vegas, NV 89129 | Internet: schear@lvdi.net ---------------------------------------------------------------------