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Certain DES keys have been called weak or semiweak based upon the number of distinct round keys which they produce. For the weak keys, all 16 round keys are identical and encryption is the same as decryption. For the semiweak keys, there are only two distinct round keys but no specific weakness of the DES with these keys has been demonstrated.
This Analysis has been a team effort. The following members of the Department of Child and Family Studies at the Louis de la Parte Florida Mental Health Institute are responsible for all aspects of the study. These members of the research team are listed according to the section of the report for which they had primary responsibility. A number of other… (More)