A digital signature system is provided on a server for use by remote clients, such as by using a browser. The server generates and maintains all of the users' keys used for producing a digital signature. A user sends a data object to the server, and the server generates a digital signature for the data...http://www.google.fr/patents/US20030093678?utm_source=gb-gplus-shareBrevet US20030093678 - Server-side digital signature system
