Gpg4usb is a very good portable PGP solution (and it's free!) and is the one I use on my encrypted USB drive. You can get it at www.gpg4usb.cpunk.deI can't really give information on your original question as I don't use that tool, but to encrypt something using gpg4usb, all you have to do is tick the box of the key you wish to encrypt in and hit "encrypt". If somebody has encrypted something to you, then paste it into the editor and press "decrypt" where it'll ask you to type in your password and it'll be decrypted should the password be correct. To generate a key, just go to Manage Keys > Keys > Generate Key and it'll take you through the process there, generally I just fill my SR username in, my tormail address and select the 4096 bit key strength with an expiry of 1 year. To find out what your public key is, right click it on the right hand side window and click "Append selected key(s) to text" and it'll paste your public key in the editor.General messages shouldn't be encrypted, some vendors will be a little bit annoyed if you encrypt every single message to them, but there are some things you should always encrypt:- Your delivery address in the shopping cart when placing an order- Any sensitive messages containing specific information about their packaging(ie, if you mention that their "example electronics" logo was poorly printed then this should be encrypted as it is something authorities could use to watch certain packages)- Tracking numbers- Any information which may endanger their/your security such as mentioning where the package come from if there are stamps on it from a specific city for examplePersonally I will not be bothered if people encrypt every message they send to me if it makes them feel more secure, I see it as a way for new users to get used to PGP and become more proficient at it. Here is my key if you wish to try sending me a sample message to decrypt, although Pine and Scout both run very good PGP club programs to get you started if you need help:-----BEGIN PGP PUBLIC KEY BLOCK-----Version: GnuPG v1.4.12 (MingW32)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=DbpW-----END PGP PUBLIC KEY BLOCK-----