A HYBRID KEY MANAGEMENT METHOD FOR ROBUST SCADA SYSTEMS AND THE SESSION KEY GENERATING METHOD THEREOF

摘要

Main terminal equipment (MTU), generate multiple subordinate terminals (sub- MTU), and multiple remote terminals (RTU) SCADA (Supervisory control and data acquisition), by the classification of the sequence from system, key forms and uses electronic signature as hybrid key management method according to the firm SACDA systems of distribution group key in groups for it, generates the main terminal equipment of a group key; In order to create himself close value (close value) master terminal and each subordinate terminal, pass through exchange electronic signature; Main terminal equipment, but group key is distributed to each subordinate terminal, provide a configuration group key comprising the initial allocation step to encrypt and decrypt by close value. As described above by a kind of hybrid key management method of firm SACDA systems, pass through the public key-based encryption between master terminal and subordinate terminal of application, symmetrically being encrypted between subordinate terminal and remote terminal with a high efficiency based on key is applied, effectively, but main alternate agreement can support the number for reducing crypto key memory in the terminal.