Signing MS-Excel spread sheets
btober at seaworthysys.com
Fri Sep 2 22:49:10 CEST 2005
I hate to admit that I still use MS-Excel rather than an open source
spread sheet tool, but workplace requirements constrain my fate...
Anyway, the problem with MS-Excel that I'm finding is that if I sign
(detached signature) an MS-Excel XLS file, then me or someone else opens
the file and then closes it even without making any changes, the
signature no longer verifies successfully. A binary comparison of the
"after" file with a "before" copy confirms that the four or five bytes
are changed by the simple fact of opening and closing the file. I figure
it must be some kind of time stamp Excel records.
Has anyone else managed a work-around for this flaw? (Aside from the
obvious -- "Stop using MS-Excel!" -- because that is a failure I cannot
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