Abstract: A new login method enables user friendly login process using X.509 digital certificate. A special purpose web page plug-in enables such login capability by plug-and-play to any web site login page. Multifold certificate is composed of multiple certificates with each of them contains different amount of personal information (FIG. 1) suitable for different business purpose. A daemon runs in user's computer to retrieve certificate and communicate with the plug-in on behalf of user. The daemon ensures the mutually agreement between user and web server on the type of certificate to be used during the login process. A password recovery method ensure smooth recovery from lose of password. The security feature allows a user to login from many different computers by transferring the multifold certificate freely. An invariant user identifier is constructed from user's personal data in a particular way (FIG. 2) so that the identifier is the same regardless where and when it is constructed.