Scheme for blocking the use of lost or stolen...

Details Scheme for blocking the use of lost or stolen... Scheme for blocking the use of lost or stolen...

2005-08-02

2005-08-02

Wright, Norman M. (Department: 2134)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S155000, C713S165000, C713S193000, C380S231000, C380S233000, C705S051000, C705S052000

Reexamination Certificate

active

06925562

ABSTRACT:
Scheme for switching a computer system (21), which is connectable via a communication interface and a network (22) to a server module (23), into a special mode of operation. The computer system (21) comprises a software component (26) for sending an identifier (w) assigned to the computer system (21) via the communication interface and the network (22) to the server module (23). In response, the software component (26) receives a token (S), issued by the server module (23), whereby the token (S) comprises a credit (C). In addition, the computer system (21) comprises a trusted hardware component (25) storing the identifier (w) and comprising a credit counter (44) with a credit which is automatically exhaustible step-by-step, and which is updateable with the credit (C) received from the server module (23). The computer system (21) has a trigger unit for switching the computer system (21) into the special mode of operation, e.g. a mode where the computer system (21) is of limited use to a user, if the credit of the credit counter is exhausted.

REFERENCES:
patent: 4650975 (1987-03-01), Kitchener
patent: 5634012 (1997-05-01), Stefik et al.
patent: 5638443 (1997-06-01), Stefik et al.
patent: 5943423 (1999-08-01), Muftic
patent: 2005/0060693 (2005-03-01), Robison et al.

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