A system and method for key escrow cryptography for use in a system comprising a sender and a receiver. Only public escrow keys are stored in the sender and the receiver. The sender encrypts a message using a secret session key (KS), and generates a leaf verification string (LVS) by combining an unique...http://www.google.de/patents/US5557346?utm_source=gb-gplus-sharePatent US5557346 - System and method for key escrow encryption
