When electronic mail is to be sent by an off-line user to a recipient who holds a digital certificate, the sender's mail program allows the sender to compose the mail, but the mail is placed in plain text in the sender's local outbox and flagged for subsequent encryption. When the sender later connects...http://www.google.es/patents/US6990578?utm_source=gb-gplus-sharePatente US6990578 - Method and apparatus for encrypting electronic messages composed using abbreviated address books
Method and apparatus for encrypting electronic messages composed using ...
