Method for updating encryption key information in communication units
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United States of America Patent
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-
Jun 28, 1994
Grant Date -
N/A
app pub date -
Feb 4, 1993
filing date -
Feb 4, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Within a communication system, an encryption controller receives unit identification information from a plurality of encrypting/decrypting communication units. For any individual communication unit, the encryption controller uses the unit identification associated with that transmitting communication unit to determine if it contains updated encryption key information. If the transmitting communication unit is not currently updated, a group call is used to send the current encryption key information to all communication units within the transmitting communication unit's group, thereby updating all active, non-current communication units. After a first predetermined period of time has elapsed, this process is allowed to repeat.
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