A method, system and program for automatic administration and management of a plurality of certificates and/or cryptographic keys, authentication of certificates, and authorization to access certificates or associated data. Each key is associated with a set of attributes so that the set of attributes...http://www.google.com.hk/patents/US7080409?utm_source=gb-gplus-share專利 US7080409 - Method for deployment of a workable public key infrastructure
