G - Physics – 06 – F
Patent
G - Physics
06
F
354/243, 354/67
G06F 12/14 (2006.01) G06F 1/00 (2006.01) G06F 21/00 (2006.01)
Patent
CA 1262575
17- ABSTRACT OF THE DISCLOSURE A system (FIG. 1) which enables a protected program (e.g., prog. A, prog. B., ...) to run only a selected plurality of computers (e.g., computer 10) including a respective unique key Ki for each computer of the plurality, the key being triple encrypted (14a) in the form EFK[EFK[Ki]]]. A respective module (16) is coupled (via 17) to each computer (10) of the plurality. A checker program (15) in each computer responds to a request (from station 11) to use the protected program by performing a single decryption procedure E?? on the triple encrypted key (step 22 of FIG. 2) and sends the result (step 23) to the module (16) as a message. The module (16) performs a single decryption procedure E?? on the message (step 25) and sends that result (step 26) back to the computer. The checker program (15) receives the module's result and performs another single decryption procedure E?? on it (step 28) to obtain key Ki. Then the checker program (15) uses key Ki to decrypt an identifier, (e.g., 14b, 14c, ...) and proceeds with the execution of the protected program only if it is identified by the decrypted identifier (step 32).
517059
Appelbaum Matthew A.
Lehman David B.
Nieglos Donald J.
Nolte Stanley C.
Oehler Michael P.
R. William Wray & Associates
Unisys Corporation
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