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-----BEGIN TYPE III ANONYMOUS MESSAGE----- Message-type: plaintext Major Variola (ret) ([EMAIL PROTECTED]) wrote on 2004-06-29: > At 04:20 PM 6/28/04 +0200, Nomen Nescio wrote: > >There is no such thing as a GPS frequency. > > I beg to differ, there are (perhaps >1) RF freq assigned to the > Constellation. Yes, there is a GPS frequency. The point I wanted to make was that it's not possible to keep the phone usable for communications but not let it reveal its (perceived) location since the location is revealed on the same band the normal communication uses. Jamming the GPS input so that the phone can't calculate its position in the first place fixes this, of course. > > It seems that for CDMA or WCDMA phones the location service is > > defined in terms of messages on the normal network layer, see a > > Google search for "position determination serviceorder". > > Yes its cheaper and allowed (for now) to triangulate (to what, 100m?) > using physics; but GPS will become cheaper and cheaper. The problem with the GPS approach for pinpointing adversaries is that it fundamentally requires cooperation from the mobile device. Yes, it's currently not trivial to hack your firmware to ignore location requests, but most of the (W)CDMA standards are public information, and phones are moving to standard platforms like Symbian, Linux or Windows, so they should become more hackable over the next few years. -----END TYPE III ANONYMOUS MESSAGE-----
