PDF Messenger: Introduction

A problem with S/MIME and PGP is that the sender and recipient require an S/MIME certificate or PGP key. Although installing a certificate and a private key is not hard, even less so when using the gateways built-in CA functionality, for most recipients getting a certificate and configuring the mail client is too difficult.

PDF encryption is a light weight alternative to S/MIME or PGP. With the PDF encryption module, the complete email, including all attachments, is converted into a password protected PDF. The password protected PDF is then sent to the recipient. The recipient can open the PDF using a standard PDF reader.

PDF encryption

The password for the PDF should then be securely delivered to the recipient.

Example PDF OTP encrypted email from Gmail inbox:

Encrypted email

Example Encrypted PDF after decryption:

Encrypted PDF