Always quit your web browser when you have finished accessing services that require authentication. Do not disclose your CamSIS password to anyone and only enter it on web pages with URLs that start https://camsis.cam.ac.uk/. Please report attempts to obtain your password by other means. CamSIS necessarily uses cookies to manage your authentication (details).
See help on CamSIS accounts if your CamSIS account isn't working, or if you don't have a CamSIS account but need one.