There is no way to design such a self-check. This isn't a lack in
GnuPG, but a design impossibility for any program. Think about it: a
"check mode" would try and account for a bug in GnuPG and warn you
that the file was not encrypted properly. However, if you're
presuming a bug, then who says you should trust the check mode?
If GnuPG completes successfully, that means it succeeded. If you want
more assurance than that, the only way to do it is to decrypt the file
and compare.
If you wanted to be really sure that GPG didn't mess something else, try
decrypting it with some other OpenPGP implementation. If you're using
perl, use Crypt::OpenPGP. (And Text::Diff to do your diff, and
File::Slurp to read in the files for Text::Diff :)
BTW, why are you encrypting these files anyway? If someone broke into
your computer they could just steal the crypto key too.
Regards,
Jonathan Rockway
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