An adaptable cryptographic method and system provides updated digital signature key pairs in a public key system by providing, through a multi-client manager unit, selectable expiry data such as digital signature certificate lifetime data, public key expiry data and private key expiry data as selectable...http://www.google.com/patents/US6978017?utm_source=gb-gplus-sharePatent US6978017 - Method and system for providing updated encryption key pairs and digital signature key pairs in a public key system
