Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2007-11-27
2007-11-27
Revak, Christopher (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C705S067000, C713S161000, C713S168000, C713S189000, C726S002000, C726S027000, C726S028000, C726S029000
Reexamination Certificate
active
10119204
ABSTRACT:
A method and system to maintain portable computer data secure and an authentication token for use in the system are provided. The present invention provides for fine-grained authentication and full security of a laptop file system. The laptop disk is encrypted and each time data is fetched from the disk the laptop sends a short message requesting a decryption key from an authentication token worn or associated with the proper laptop user. If the user and his/her token are “present,” then access is allowed. If the user and his/her token are not “present” (i.e., within a predetermined radius), then access is disallowed and all in-memory data is flushed to the disk. The user wears the small authentication token that communicates with the laptop over a short-range, wireless link. Whenever the laptop needs decryption authority, it acquires it from the token; authority is retained only as long as necessary.
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Corner Mark D.
Noble Brian D.
Doan Trang
Revak Christopher
The Regents of the University of Michigan
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