Cryptography – Key management – Having particular key generator
Reexamination Certificate
2007-05-01
2007-05-01
Zand, Kambiz (Department: 2134)
Cryptography
Key management
Having particular key generator
C380S044000, C380S046000, C380S047000
Reexamination Certificate
active
10400440
ABSTRACT:
An expansion key generating device that receives encryption key data as input, and outputs plural expansion key data, comprising: a data dividing unit operable to divide the encryption key data into plural part key data; and plural key conversion units being connected in series, which output the plural expansion key data. Each of the plural key conversion units includes: an output calculation unit operable to receive the plural part key data or plural output data from a preceding key conversion unit as plural input data, which executes a fixed conversion process for each of the plural input data in so that each bit value of each of the plural input data does not interfere each other, and further outputs plural output data to a subsequent key conversion unit; and an expansion key calculation unit operable to combine plural input data and calculate the expansion key data.
REFERENCES:
patent: 5003596 (1991-03-01), Wood
patent: 6304657 (2001-10-01), Yokota et al.
patent: 2002/0021802 (2002-02-01), Muratani et al.
patent: 2003/0198345 (2003-10-01), Van Buer
patent: 1 081 889 (2001-03-01), None
Ohmori Motoji
Yokota Kaoru
Wenderoth , Lind & Ponack, L.L.P.
Zand Kambiz
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