Is it possible to e-mail an .exe or .zip file so that only the recipient can unzip it & it cannot be sent from the recipient to a second recipient? I.e. the file cannot be re-sent from that person to another person.

SNIP

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You need to encrypt the message using a key. You will have the public and private key and the recipent should have the public key. Only the recipent will be able to decrypt the message.

You need to encrypt the message using a key. You will have the public and private key and the recipent should have the public key. Only the recipent will be able to decrypt the message.

Thanks. How would I actually do this?