Control system for cryptographic keys in computer network

摘要

The control system includes two cryptographic keys stored for each authorised user (4,5) in the memory of the network control server (2). The keys are the Public Key - PuK - and the Private Key - PrK. The server also has a PuK and PrK to authenticate received messages. Messages are available to all Trusted Third Parties - TPP - on the network as well as the intended recipient. However they cannot read the message without the appropriate PrK. If a private key is compromised, a message is sent to TPPs. The message consists of a new public key. The receiving terminals substitute the new public key for the old one.