Beware of phishing via the web - give your Nikhef password to websites only if they show a green address bar. Like this: 
Enter your username and password
A service has requested you to authenticate yourself. Please enter your username and password in the form below. This is the Nikhef SSO username and password, i.e. the one also used for your access to email.
Help! I don't remember my password.
We are sorry, but both login and password are required for succesful authentication. If you have lost your password, please contact the Nikhef help desk (helpdesk at nikhef.nl) or call extension 2200 during office hours
The Nikhef SSO service and IdP are provided by the CT group. For support, please contact the help desk (helpdesk@nikhef.nl, or by phone on +31 20 592 2200).
SimpleSAMLphp IdP Software Copyright © 2007-2013 Feide RnD