FormsAuthentication.Encrypt

So, FormsAuthentication uses RijndaelManaged cryptography. We have FIPS Policy enabled on our servers and must avoid using non-FIPS-compliant algorithms. So, we were using FormsAuthentication.Encrypt like so:

string encryptedTicket = FormsAuthentication.Encrypt(ticket);

What could I use in its place that is FIPS-compliant?