Abstract
Wireless sensor networks are a challenging field of research when it comes to security issues. Using low cost sensor nodes with limited resources makes it difficult for cryptographic algorithms to function without impacting energy consumption and latency. In this paper, we focus on key management issues in multi-hop wireless sensor networks. These networks are easy to attack due to the open nature of the wireless medium. Intruders could try to penetrate the network, capture nodes or take control over particular nodes. In this context, it is important to revoke and renew keys that might be learned by malicious nodes. We propose several secure protocols for key revocation and key renewal based on symmetric encryption and elliptic curve cryptography. All protocols are secure, but have different security levels. Each proposed protocol is formally proven and analyzed using Scyther, an automatic verification tool for cryptographic protocols. For efficiency comparison sake, we implemented all protocols on real testbeds using TelosB motes and discussed their performances.
Highlights
Nowadays, the Internet of Things (IoT) is a reality: more and more devices are used to monitor our environment and to interconnect such embedded objects
IoT relies on wireless sensor networks (WSNs) for ensuring connectivity between nodes on the lower level of the network architecture
We summarize some of the key revocation and key renewal protocols for WSNs
Summary
The Internet of Things (IoT) is a reality: more and more devices are used to monitor our environment and to interconnect such embedded objects. IoT relies on wireless sensor networks (WSNs) for ensuring connectivity between nodes on the lower level of the network architecture. In such a context, some sensitive applications often require cryptographic mechanisms in order to achieve security. Most of the military applications of WSNs require a high level of security [1]. It is important to design secure communication mechanisms between nodes of the network. These mechanisms can be achieved thanks to modern cryptographic primitives. Once we have established a secure communication channel in the network, several situations might occur; a node can run out of battery, even get destroyed, or just leave the network, or a new node can join the network
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