H - Electricity – 04 – K
Patent
H - Electricity
04
K
325/27, 340/70
H04K 1/00 (2006.01) G07F 7/10 (2006.01) H04L 9/32 (2006.01) H04L 12/22 (2006.01)
Patent
CA 1242501
12 ABSTRACT: To differentiate between different subscriber stations of a message transmission system, so-called identifications can be used. By listening-in on the exchange of information between the subscriber station and an exchange over a message transmission channel a fraudu- lent user can overhear the identification and consequently utilize the services of the exchange by imitation of the external identification. To enable the detection in the exchange of an illegally copied identification of a sub- scriber station, the exchange transmits a continuously changing encoding rule for forming the identification of the subscriber station, or the identification of the sub- scriber station is based on combining fixed and variable data.
477182
Grauel Christoph
Scheinert Stefan
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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