If that key is a password, you need to share it with the person you want to be able to view the document. Somehow share the decryption key securely so they can decrypt the attachment.
Agree on what type of encryption to be used.What that means is you and your recipient need to: It would be nice if email supported some kind of standard encryption for attachments, but it doesn’t - not really. The net result is the same: your document cannot be accessed by anyone who doesn’t have the means to decrypt it (such as a password). Attach the encrypted document to an email.What you’re looking for is something like this: Another approach is to use a ProtonMail account, which handles encryption well. There are more complex solutions that are more commonly found in corporate situations. Tools that use the “zip” format (like 7-Zip) are both secure and ubiquitous, making it easy for your recipient to extract the contents (assuming they have the password). Since there is no common, easy standard for securing attachments, add a password and encrypt the document before attaching it.
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