Executing permutations

Details Executing permutations Executing permutations

2005-03-08

2005-03-08

Barron, Gilberto (Department: 2132)

Cryptography

Particular algorithmic function encoding

C380S037000, C708S209000, C708S250000, C712S300000

Reexamination Certificate

active

06865272

ABSTRACT:
A method for changing the bit-order of a data value in a data processing system having a register capable of storing data strings which each comprise a plurality of sub-strings that are not individually addressable, the method comprising assigning an output data string by the steps of: loading the data value into a first data string; generating, for each sub-string of the output data string, a corresponding intermediate data string, each sub-string of which corresponds to a selected bit on the first data string and has all its bits equal to the value of the selected bit; and generating the output data string, in each sub-string of which each bit has the same value as the bits in a selected sub-string of the intermediate data string that corresponds to that sub-string of the output data string.

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Multiple Master Keys, IBM Technical Disclosure Bulletin, vol. 32, No. 8A, Jan. 1, 1990, pp. 239-242.

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