System for the checking of limited access to authorized time slots renewable by means of a portable storage device
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United States of America Patent
Stats
-
Jun 16, 1998
Grant Date -
N/A
app pub date -
Mar 7, 1996
filing date -
Jul 13, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to systems for checking access limited to authorized time slots renewable by means of a portable storage device. The system comprises, for this purpose, an element (LE) producing electronic keys formed by a data element pertaining to a time slot and by the signature of this data element. These keys are loaded into devices such as memory cards (C). Electronic locks (L) capable of verifying the signatures are implanted in the different (physical or logical) locations, the access to which has to be guarded. Application to the checking of access to buildings or computer systems.
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