PostgreSQL has been installed on the LP servers without the contrib/pgcrypto package that allows fields to be encrypted. Unlike MySQL, encrypted fields are not part of the standard release, so you need to install the contrib/pgcrypto procedures to get this functionality. I believe that most PostgreSQL installations do install this package.
I asked tech support about this, and they said that if sufficient interest were shown here (in the forums), that they might install it.
So - is anyone else interested?