This module originally developed by mssarath is to create an E-Card for a friend. After doing this a message is send to the desired person(s) so (s)he can visit the website and take a look at the message left by the friend.
This module allows users to log into your site securely without usernames and passwords. It uses digital/identity certificates users have imported into their browsers as part of a public key infrastructure (PKI). The certificates can be generated by Drupal's PKI Registration Authority module or any other registration authority (RA) / certification authority (CA).
When a Drupal page is accessed via HTTPS the module checks for certain environmental variables that contain the user's unique information, such as an email address. Depending on the settings it then logs the user in or, if enabled, creates a new account.