Systeme d'authentification analogique reciproque entre un terminal et une ligne de transmission
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United States of America Patent
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-
Jul 25, 1989
Grant Date -
N/A
app pub date -
Apr 14, 1988
filing date -
Apr 17, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a system for mutual authentication between a transmission line and a terminal, e.g. a prepayment telephone set. The telephone (2) is connected to the line (14) via a monitoring device (18). Electronic circuits (18) and (12) are associated with the monitoring device and with the telephone in order to generate authentication frequency signals throughout the call at inaudible frequencies.
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