Data processing: database and file management or data structures – Database design – Data structure types
Patent
1997-12-22
1999-11-23
Homere, Jean R.
Data processing: database and file management or data structures
Database design
Data structure types
707202, 39518401, 395703, 395712, G06F 1108
Patent
active
059917741
ABSTRACT:
A method for uniquely identifying a file, along with its particular version ID, used in an application program by a central processing unit provides a system for file security. The method computes a CRC for a file and then appends a version string and CRC at the end of the file according to its version ID. The added CRC/version record information is non-destructive. Once appended, the record will be transported with the file when ever it is moved or copied. CRC allows the integrity of the file to be verified at any time and is used to detect viruses or corrupted or tampered files at startup and also during runtimes of the file and its associated application. The operating system will store the new file length in a file allocation table and will also copy a file seal with the file. When used with a set of files for a particular installation, the file seal provides a unique bill of materials to identify the exact file contents of the particular installation. Down loadable files will then be compared with the allocation table to verify the version of the files and will provide error messages if they are not compatible with the installed system base.
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Grosser John T.
Saylor Michael J
Tate Allan R.
Femal Michael J.
Golden Larry I.
Homere Jean R.
Schneider Automation Inc.
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