Method for generating and distributing strong DES keys

Details Method for generating and distributing strong DES keys Method for generating and distributing strong DES keys

2005-07-22

2010-02-02

Dinh, Minh (Department: 2432)

Cryptography

Key management

Having particular key generator

C380S029000

Reexamination Certificate

active

07657030

ABSTRACT:
A method of generating a strong DES cryptographic key that doesn't require checking for parity or weak keys in the resulting key. First, all possible hexadecimal values are generated. Next, all possible two-hexadecimal value combinations are generated, where one of the two-hexadecimal values in a combination has odd parity, and the other even parity. Then, eliminate hexadecimal values E0, 01, F1, FE, 1F, 0E, 1E, and 0F from the list of all possible two-hexadecimal value combinations. Next, arrange each remaining two-hexadecimal value combination once in a user-definable order on a user-definable medium, such that the hexadecimal values alternate even and odd parity . Then, select eight unique two-hexadecimal value combinations on the user-definable medium in a user-definable manner. Lastly, use the selected eight two-hexadecimal value combinations as the DES cryptographic key.

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“LineGuard 9000 Remote Port Manager—User's Guide”, Western Datacom, Mar. 2004, Retrieved from the Internet on Jan. 17, 2009: <URL: http://www.western-data.com/documents/BETA%20LG9000%20Users%20Guide.pdf>.

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