Abstract
The Internet of Things (IoT) is a concept that includes physical devices, web-enabled devices, and the entire network of connections that they use to communicate. The IoT enables these objects to be sensed and controlled remotely across existing network infrastructure, creating opportunities for more direct integration between the physicalworld and computer-based systems. Nowadays, 5G(fifth generation) systems have the potential to make the IoT concept becomes reality. However, it is difficult for the 5G network against eavesdropping due to the characteristics of 5G networks. In this paper, we have proposed the ElGamal Cryptography with Public Key Infrastructure (PKI) techniques on the communication from the Base Station (BS) to Relay Station (RS) and RS to RS, then finally from RS to Subscriber Station (SS) to against replay attacks, man-in-the-middle (MITM) attack and denial-of-service (DoS). Through the discussion on the proposed mechanism and it has the probability to ensure the confidentiality, integrity, availability, and non-repudiation of the transmitted data. We have discussed the performance analysis of the proposed mechanism and given a conclusion on the discussion. From the result, it shows the mechanism can enhance the security level on the 5G networks.