A method and system for issuing anonymous, or user-independent, certificates for secure communication over a network, such as the Internet, to provide authentication and automated login to electronic services. A pool of user-independent certificates is generated. Once the user is identified, a user-independent roaming certificate is automatically transferred to the user's computer for encryption of communications during a single session. Once the user completes the online session or transaction, the issued digital certificate and associated key material is released back to the pool of digital certificates and can be re-used.