gpg4win.org/
bajwork.blogspot.com/2007/08/pgp-pipeline-component.html
social.msdn.microsoft.com/Forums/sv-SE/biztalkr2adapters/thread/f6ad66cd-cdbe-486f-bc04-c0177b709183
SFTP adapter in Biztalk 2010
If you need SFTP then you can use the community SFTP adapter: http://sftpadapter.codeplex.com/
or the N Software adapter: http://www.nsoftware.com/products/biztalk/