Encryption of eMail adresses in the user table

[Code-Worker]

Hello,

due to security reasons I have to encrypt the email addresses in the user table in a form that is not readable by humans (like Base64 or far better AES).

I am using version 5.0.5 of vBulletin.

Is there any plug-in that provides the conversion of email addresses into an encryption or could anybody of you help me to find the code to change?

Thank you,
Code-Worker