Secure SCADA communication by using a modified key management scheme

► This paper presents a new key management scheme for SCADA networks. ► The session key generation devices are displaced from slave side to master station. ► The ECDH protocol is used to increase the security of the master key. ► The Poisson process is used to model the SI and QoS. ► Resources in slave side, network speed and traffic, SI and QoS are improved.