Encryption protects both sides of transactions and you definitely need to learn it before trying to order. The other three responses provide the methods to learn. Basically you are going to need to go to your vendors profile page and import his pgp public key posted there into your soon to be downloaded pgp program.
Always use pgp to encrypt your shipping info. If you lose your pgp private key and have 2-FA enabled you will lose access to your account. Be sure to make a backup of your pgp key pair to a safe place.
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