Why would attachments be considered part of the body?
Encrypt them before uploading them, and send the decrypting key in the body.
Encrypt them before uploading them, and send the decrypting key in the body.
But Gmail itself may handle attachments differently.
AFAIK, Gmail handles attachments the same.
Because if you look at the low-level structure of email, "attachments" are just parts of a body that is in multipart/mixed MIME type.
Answering the GP, that varies from one implementation to another. Most clients encrypt attachments, but it looks like this one extension only encrypts the textarea contents.