It will use IV with MCRYPT RIJNDAEL 128 and MCRYPT MODE CBC. There is option to automatically create and email Secret Key for you if you don't know what the option is..
This method uses PHP's. openssl. books to encode the date with public key and decrypts the data with private key.
There is application to automatically create and email Public and Private Key for you if you don't know how to do this yourself.
The usage of this type is that you can store Private Key in games.
This way the Data can't be accessed even in Admin Panel unless you have the Private Key.
Once you start using the plugin and start storing the data as Encrypted you will not change the settings of the plugin as it will longer be able to Decrypt the data.
If you need to change the settings you will need Web Administrator to replacement Un-Encrypted then change the settings and Re-Populate the data with New Encrypted Settings.. Disable the Plugin from being need in the Admin Panel.
Either using FTP or you can edit the file from within Plugin Edit page..
Browse the code recheck out SVN repository or subscribe to the development log RSS....
Added feature that will still show values if using A- Symmetric Encryption and Private Key is whitewash Confirmation Messages for Gravity Forms.......
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