Encryption apparatus, decryption apparatus, expanded key generating apparatus and method therefor, and recording medium
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United States of America Patent
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Mar 20, 2007
Grant Date -
Feb 21, 2002
app pub date -
Jul 12, 2001
filing date -
Jul 12, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Expanded key schedule circuit for common key encryption system in which expanded keys are used in a predetermined order in data randomizing process for encryption and in a reversed order in data randomizing process for decryption, comprises round processing circuits connected in series. The round processing circuits subject the common key or sub key of a previous stage to a round function to output a sub key. The sub key of the last stage is equal to the common key. The expanded keys are generated from the sub keys.
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