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eXile
I'd go for an external program that does the encryption. On most unices there is openssl which can do stuff like that from the commandline, but i guess your users aren't on unix (or 'kings of the commandline').
<p>
If you use email as your way of transportation of files, you could think of using PGP or GPG as a way to do public-private key encryption-type things.
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