A Lightweight Cryptographic Scheme with Dynamic Key

Abstract

Internet of things (IoT) devices have been widely used, but their communication security is easily overlooked. Moreover, some data collected by the IoT devices may lead to the breach of users’ privacy. In order to ensure secure communication between IoT nodes and servers, we propose a Iightweight cryptographic scheme with dynamic key. In this scheme, pseudo stream cipher is put forward for simplifying key synchronization and data encryption, which can effectively reduce the consumption of the IoT nodes. The mutual authentication, session key synchronization and updating are completed through several encrypted communications respectively. Meanwhile, the key length and update cycle are variable to prevent attacks. We compared the scheme’s security and performance with some Iightweight authentication and cryptographic schemes. According to the analysis, the proposed scheme can provide more security features with low overhead of communication which is suitable for protect communication security of IoT nodes with limited resources and power.