Research on secure key management in Wireless Sensor Networks (WSNs) using cryptography has gained significant attention in the research community. However, ensuring security with public key cryptography is a challenging task due to resource limitation of sensor nodes in WSNs.
In recent years, numerous researchers have proposed efficient lightweight key management schemes to establish secure communication. In this paper, the authors provide a study on several key management schemes developed for WSNs and their taxonomy with respect to various network and security-metrics.