Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Reexamination Certificate
2008-08-28
2011-12-06
Lipman, Jacob (Department: 2434)
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
Reexamination Certificate
active
08073141
ABSTRACT:
An execution unit adapted to perform at least a portion of the Data Encryption Standard. The execution unit includes a Left Half input; a Key input; and a Table input. The execution unit also includes a first group of transistors configured to receive the Table input, perform a table look-up, and output data. The execution unit further includes a first exclusive-or operator having two inputs and an output. The first exclusive-or operator is configured to receive the Left Half input and the Key input. The execution unit also includes a second exclusive-or operator having two inputs and an output. The second exclusive-or operator is configured to receive the data output by the first group of transistors and to receive the output of the first exclusive-or operator. The execution unit also includes a third exclusive-or operator having two inputs and an output. The third exclusive-or operator is configured to receive the Left Half input and the data output by the first group of transistors.
REFERENCES:
Bruce Schneier, Applied Cryptography, 1996, John Wiley and Sons, Second edition, pp. 270-278.
Olson Christopher H.
Rarick Leonard D.
Jones Anthony
Lipman Jacob
Oracle America Inc.
Park Vaughan Fleming & Dowler LLP
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