Method and apparatus for changing the master key in a cryptographic system
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United States of America Patent
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Nov 20, 1990
Grant Date -
N/A
app pub date -
Mar 15, 1985
filing date -
Mar 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for changing the key in a cryptographic system or device are disclosed. A memory contains three storage areas for pending, active, and retired keys. New keys are loaded into the pending storage area. The key is changed by shifting the pending key into the active storage area and shifting the active key into the retired area for use by applications which have not been made aware of the key change. When an application presents a retired key, use of the retired key is allowed and the new key is returned to the application.
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