My advice is to use PGP. In the interests of full disclosure, I used to be the CTO there. I think it's a fine product. Yes, I know Network Associates has put it into limbo. It will come out of limbo. You can still find versions of it stores or on the Web. Last week, it was the #4 best selling software product on Amazon. Not bad for something in limbo.
For more information on this topic, visit these other SearchSecurity.com resources:
Best Web Links: Cryptography/PGP/PKI
Strom's Security Tool Shed: SigabaSecure not bad, but PGP is better
Strom's Security Tool Shed: File encryption software ideal for laptops
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