[opensuse] secure time

perhaps a simple question, but it kept me awake all night and google didn't help either.. Most services have a ssl/tls equivalent, like http, imap, ldap. But how about an ssl/tls version of ntp? How can i know for certain that a time server is who he claims to be? Or am i looking for something impossible?? There are situations where a gps-receiver is not feasable. hw -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org