Improving the security of mobile telephones against...

Details Improving the security of mobile telephones against... Improving the security of mobile telephones against...

H - Electricity

04

Q

H04Q 7/34 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2286964

A method of detecting an eavesdropping device (IC) which is interposed between a mobile telephone (MT) and a base station (BS2) and which accepts, as a purported base station, a call from the mobile telephone (MT) and then forwards it, as a purported mobile telephone, to the base station (BS2) involves storing data of the base stations (BS1, ..., BS5) used by the mobile telephone (MT) in the mobile telephone (MT). When a new connection is set up to a base station (BS2), the data newly determined during this connection setup are compared with the data to be expected for this base station (BS2) in view of the stored data. If the data differ, an error signal is generated in the mobile telephone (MT). This error signal may initiate a release of the connection with this base station (BS2) or trigger an alarm message to the user. This improves the security of, e.g., GSM mobile stations against eavesdropping.

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