Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2008-03-05
2011-12-06
Colin, Carl (Department: 2493)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
Reexamination Certificate
active
08074079
ABSTRACT:
An anti-attacking method for a private key is provided. The method includes using a plurality of storage areas for storing the same security information. The method also includes selecting one of the storage areas as a currently-used storage area for accessing the security information and synchronously updating the security information stored in the other storage areas while updating the security information stored in the currently-used used storage area when generating a digital signature by using a signature rule and the private key. The method further includes selecting one of the other storage areas as the currently-used storage area for correctly accessing the security information when detecting an attack on the security information stored in the currently-used storage area during generation of the digital signature. Therefore, it is possible to prevent the attacker from stealing the private key.
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Colin Carl
J.C. Patents
Phison Electronics Corp.
Zaidi S. Ali
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