Process for securing and for checking the integrity of the secured programs
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United States of America Patent
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Jun 29, 1993
Issued Date -
N/A
app pub date -
Mar 20, 1992
filing date -
Feb 23, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For securing programs contained in a system storage and for checking their integrity, the programs are in each case coded by a symmetric cryptographic algorithm with the application of a readback secured, secret key, and a check number for each program is simultaneously formed and stored in the storage of the system. For checking the integrity, the programs are then coded again in the same manner and the check number thus obtained in each case is compared with the check number stored at the first coding. It is possible to derive from the result of comparison a criteria for activation or locking the following programs.
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