I would like to send a document that is confidential to users that have no clue what PGP is (so no point in teaching them how to install it etc...) via email.
The real question is how to do that?
Currently I am thinking of the following approaches and wondering whether anybody knows which one is the most secure:
I have the following options:
- encrypt it using the security functionality provided by Microsoft Office Word. Then the name of the document is visible! And I don't know whether or not I should trust this encryption method from Word.
- Encrypt it with WINRAR. I can encrypt even the document name, so upon opening, they should be prompted to provide the password and hence even the document name is encrypted.
- Make it a PDF file and encrypt it using PDF. Similar to Word maybe a bit more powerful / or less??
Of course some would say use a combination, but I don't want to look that paranoid to my customers ;)