Method of encryption and decryption with block number dependant key sets, each set having a different number of keys
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United States of America Patent
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Jul 12, 2005
Grant Date -
N/A
app pub date -
Aug 15, 2000
filing date -
Aug 31, 1999
priority date (Note) -
In Force
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Abstract
The subkey data generating unit 101 has two different subkey key generation processes. When encrypting a (T*n)th plaintex block (where T denotes a predetermined cycle and n is a positive integer), sixteen sets of subkey data are generated. In all other cases, two sets of subkey data are generated. The encrypting unit 100 encrypts the plaintex using the generated sixteen or two sets of subkey data.
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