PGP for ASP.NET?

What is the best/simpliest to use PGP library for use with an ASP.NET application?

We need to be able to encrypt a text 开发者_C百科file for submission to a vendor via FTP.

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http://www.codeproject.com/KB/security/sharpprivacy.aspx?df=100&forumid=15716&exp=0&select=573797 and http://www.bouncycastle.org/index.html

Edit: I'd go for bouncy castle's api.