Lightweight IKEv2: A Key Management Solution for both Compressed IPsec and IEEE 802.15.4 Security

With the advent of 6LoWPAN [1], wireless sensor networks (WSN) can be connected to the traditional Internet using the well tested IP protocol. These protocols form the Internet of Things (IoT) or strictly speaking the IP-connected IoT. There is no doubt that the 6LoWPAN enabled sensors will be the underlying technology of the IoT [2]. In the IPconnected IoT, IP enabled WSN are connected to the untrusted, unreliable, and vulnerable Internet. Moreover, the wireless medium adds to untruthfulness and vulnerability. To enable secure communication with the traditional Internet one of the well tested secure Internet protocols such as IPsec should be extended to WSN. Network or higher layer security and link layer security are not interchangeable. Upper layers are used to provide end-to-end security whereas link layer security controls access to the wireless medium. It is important to detect data modification attacks as early as possible in the wireless medium. With upper layer security protocols such as IPsec the authenticity of the data is verified at the end nodes as