Re: Location Escrow anyone ?
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ZURICH (December 28, 1997 4:12 p.m. EST http://www.nando.net) - Swiss police have secretly tracked the whereabouts of mobile phone users via a telephone company computer that records billions of movements going back more than half a year, a Sunday newspaper reported.
Don't be fooled that this is a swiss only problem. It's being done here in Amerika right now.
The FCC has issued a ruling that will require all cellular telephone carriers to provide location information on all 911 calls. By the year 2001, this location information is to provide 125 metres of accuracy 67% of the time. Helping emergency services locate 911 callers is a great excuse for installing a cellular location system. Even better than the excuses they gave for eavesdropping-ready digital switches and limits on encryption. An accuracy of 125 meters seems quite impressive considering the facts that cellular channels are plagued by very long multipath dispersion and that a narrowband FM signal is much less than ideal for calculating delay. - -------------- Kay Ping nop 'til you drop -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: cp850 iQEQAwUBNK4a2hHPAso8Qp7tAQFI1wfRARzxzUTRWkuETjkWrz7Gh4StMEwhCZ6C Nzh2i2ymTq2/hMMdx7L8tuc2N5wISlBjzJtJGKnyQTHYJs6SMkvYLQa89H4v4MyH 9NJK6wSqx1OLEmgPwCoJWo8NUkH1jwPvhRfb+A/KE3raYazMd1fY+EgL/P3R216s j0F0RsPUFvMS3m+/j5rKFoatuG1Qc6b2p8QnQLxgxyePoEScEEcfxiCrGGH75YEF 5yiJMi11LraUnDyJtZ/9xVXAFAEjLM9IYyCapfleIEUNisu9Iu3R9V/FIBdEom3O uL7we6ETWSrYCFxdmrDq64q7wi1ygN/d1IvIFgNzSol/D9Y= =czyT -----END PGP SIGNATURE-----
At 1:35 PM +0000 1/3/98, Kay Ping wrote:
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ZURICH (December 28, 1997 4:12 p.m. EST http://www.nando.net) - Swiss police have secretly tracked the whereabouts of mobile phone users via a telephone company computer that records billions of movements going back more than half a year, a Sunday newspaper reported.
Don't be fooled that this is a swiss only problem. It's being done here in Amerika right now.
The FCC has issued a ruling that will require all cellular telephone carriers to provide location information on all 911 calls. By the year 2001, this location information is to provide 125 metres of accuracy 67% of the time.
The FCC may have ruled it, but its doubtful that the carriers can provide it. Doing better than than a cell sector will depend on many factors, including: specific technology (analog, GSM, CDMA, etc.), frequency and local propagation characteristics, especially multipath conditions.
From parallel discussions on the cryptography list:
800 MHz analog may be the most difficult. GSM perhaps can reach 500 meteres under ideal conditions (Andreas Bogk). IS-95/CDMA probably a bit better than GSM due to the very high data (chip) rate and spread spectrum's better multipath characteristics, although the system's multipath performance most improves communications not ranging (Phil Karn, Qualcomm). --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 ---------------------------------------------------------------------
participants (2)
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Kay Ping
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Steve Schear