Securing Xserver

Hi, I have a project which involves using LTSP (linux Terminal Server Project) with SuSE 7.3 as the server. There will be 50 terminals with 200 accounts just to be used for email and Web Surfing. However as far as I can see I have more then enough security related concerns. NFS, NFS swap (looks like I need since the terminals have less then 64 MB Ram), Xserver The project is for a government office so security concern (both internal and external) is high. What are my best options in securing /encrypting these services ? Pointers are really appreciated. Thanks -- Togan Muftuoglu Unofficial SuSE FAQ Maintainer http://dinamizm.ath.cx