Accounting in MySQL - Password

Hi, This may be a simple question but I was not able to find a setting for this. Basically, I'm using freeradius with LDAP for my user base and MySQL for accounting. I've loaded schema on MySQL, configured freeradius and my two tables get populated properly (radacct and radpostauth). My Clients are using TTLS/PAP and PEAP/MSCHAP protocols. When I look in radpostauth, the "pass" field is populated in clear text when TTLS/PAP protocol is used. Is there a way to disable this or at least encrypt the password? Password logging is only a problem when we use MySQL. Freeradius Log files do not contain passwords. Thanks.