Information security – Access control or authentication – Network
Reexamination Certificate
2006-10-17
2006-10-17
Wright, Norman M. (Department: 2134)
Information security
Access control or authentication
Network
C726S004000, C726S005000, C726S006000, C380S202000, C380S228000, C380S229000
Reexamination Certificate
active
07124436
ABSTRACT:
A security unit to prevent unauthorized retrieval of data includes an encrypting unit for encrypting data in accordance with commands received by the security unit, and a common register for storing both intermediate results and final results of the data encryption. A switching element operatively coupled to the register selectively outputs the contents of the register. The switching element is controlled to prevent external access to the intermediate results of the encryption. The security unit is particularly useful as part of a memory unit that is attachable to a recording/reproduction device such as a digital audio recorder/player.
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Ishibashi Yoshihito
Kihara Nobuyuki
Mizuno Asami
Okaue Takumi
Sakamoto Yukihiro
Frommer William S.
Frommer & Lawrence & Haug LLP
Presson Thomas F.
Sony Corporation
Wright Norman M.
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