Department's Linux hosts are now using kerberos single sign on authentication. This means that when you login to a Linux classroom or office workstation hosts with your CS department's master password, you get a kerberos ticket, which can be used to automatically authenticate against other department's network services. Currently kerberos tickets are used to authenticate remote ssh logins and Samba and NFS file shares. Department's Linux ssh clients and ssh servers have been configured to use, accept and forward these tickets, so now you can ssh from one linux hosts to another without typing your password again (and without a ssh secret key). More details and instructions are available here.