Security in Mira networks¶
Link-layer encryption means that the packets being sent on the wireless link between nodes in the network are encrypted to protect agains eavesdropping and injection of packets.
Figure 1: Secure links between nodes.
In Mira networks AES (of at least 128 bits) with CCM mode is used to obtain the link-layer security. This means that only nodes that share the network's AES keys can access the network and the data on the network. AES-CCM provides both encryption and authentication of packets.
Some applications require additional levels of security. It may be required to ensure data integrity for data going outside of the network onto non-secure data links. Or it may be required to ensure data privacy where the application must prove that intermediate routing nodes can not get access to the data inside the packet. Another case may be where it's required to know that data originated from the correct device, to avoid spoofing.
Figure 2: Secure connection between end node and server.
For applications that require end-to-end security it's recommended to use DTLS or another proven method for data privacy and authentication. Thanks to Mira having IPv6 support, any stack agnostic DTLS implementation should work fine, for instance tinyDTLS that is available in a standalone version from RISE SICS.