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In this paper, we consider a more general four-terminal memorylessrelay-eavesdropper channel with state information (REC-SI) and derive anachievable perfect secrecy rate for it. We suppose that the state informationis non-causally available at the transmitter and relay only. The transmitterwishes to establish a secure communication with the legitimate receiver by thehelp of a relay where a confidential message will be kept secret from a passiveeavesdropper. We consider active cooperation between the relay and transmitter.The relay helps the transmitter by relaying the message usingdecode-and-forward (DF) scheme. The proposed model is a generalization of someexisting models and the derived achievable perfect secrecy rate is compared tothe special cases. The results are also validated numerically for the additivewhite Gaussian noise (AWGN) channel.

Achievable Secrecy Rate for the Relay Eavesdropper Channel with Non-Causal State Available at Transmitter and Relay