Encrypted emails are stored on mailbox server using disk level or block level encryption. In this approach all the emails are encrypted using single key and are unencrypted on the fly when accessed by the owner of the email. The shortcoming of this approach is that the user with root privileges will be able to access the emails of all the users.

Suggest and implement a mail encryption solution which can restrict even the root user from accessing the encrypted mails.

Notes: Participants have to simulate the mailbox server with some sample mails in order to demonstrate the working of solution.

Sample Data Required: No