This is exactly the same thing I was thinking of on how to improve cloud security :)

Djigzo email encryption gateway is an open source email encryption gateway with support for S/MIME and PDF encryption (www.djigzo.com). You can set it up in such a way that all outgoing email to a specific account (for example your Gmail account) is encrypted with a certificate (I use it in a similar setup to encrypt all my email sent to my BlackBerry). For Firefox there is already an S/MIME add-on that allows you to decrypt your S/MIME email from your Gmail inbox. The Gmail add-on allows you to sent encrypted email as well but this requires certificates for all receivers. So, I’m thinking of building my own add-on that allows you to encrypt the message with a gateway certificate. The email is then sent to the gateway instead of directly to the intended recipients (the message need to contain some meta info about the intended recipients). The gateway decrypts the message and then forwards the message to the intended recipients (the gateway is used as a relay). To make sure that it’s not an open relay all messages need to be digitally signed before being encrypted (together with a timestamp). I use a similar setup for a BlackBerry add-on we have created which allows you to send and receive S/MIME email with a BIS account.

If you want to use Gmail as an encrypted email backup and can run an email server you can chekout http://www.djigzo.com. It’s open source and a VMware virtual machine is available.

This post was mentioned on Twitter by emailservicegde: How Can We Keep Email Safe In The Cloud? http://bit.ly/3E1qgr #saas #cloud #security #encryption…