Application code integrity check during virtual machine runtime
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United States of America Patent
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N/A
Issued Date -
Mar 2, 2006
app pub date -
Aug 30, 2004
filing date -
Aug 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Protecting an application of a multi-application smart card against unauthorized manipulations. A system and method for guarding against unauthorized modifications includes partitioning the application into a plurality of basic blocks. Basic blocks are programming atomic units that have one entry point and one exit point and comprises a set of data units. For each basic block a check value associated with a basic block is computed wherein the check value is a function of the data units of the basic block. This check value is some how remembered and later recalled and checked either during execution of the corresponding basic block of the application program or prior to execution of the application program. During or prior to execution of the basic block the re-computed check value is verified to be the same as the remembered check value. If not, an error condition is indicated and a corrective action may be taken.
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