Cryptography – Key management
Reexamination Certificate
2005-09-13
2005-09-13
Morse, Gregory (Department: 2134)
Cryptography
Key management
C380S278000, C380S283000, C380S262000
Reexamination Certificate
active
06944300
ABSTRACT:
A method for migrating a base chip key from a first computer system to a second computer system is disclosed. A first computer system includes a base chip key1, and a second computer system includes a base chip key2. Using a first certificate for the base chip key1, a manufacturer of the second computer system generates a second certificate for the base chip key1. Similarly, using a first certificate for the base chip key2, a manufacturer of the first computer system generates a second certificate for the base chip key2. A first data packet is then sent from the first computer system to the second computer system. The first data packet includes a first random number and all the data required to reproduce the base chip key1in the first computer system. The first data packet is also encrypted with the base chip key1's public key. In return, a second data packet is sent from the second computer system to the first computer system, and the second data packet includes the first random number and a second random number, signed by the base chip key2. The base chip key1is then erased from the first computer system. Finally, the base chip key2in the second computer system is replaced by the base chip key1.
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Challener David Carroll
Ovies Hernando
Dillon & Yudell LLP
Grosser George E.
Ho Thomas
International Business Machines Corporaton
Morse Gregory
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