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Similarly to elsewhere on the Internet, practical security in the Internet ofThings (IoT) is achieved by combining an array of mechanisms, at work at alllayers of the protocol stack, in system software, and in hardware. Standardprotocols such as Datagram Transport Layer Security (DTLS 1.2) and TransportLayer Security (TLS 1.2) are often recommended to secure communications to/fromIoT devices. Recently, the TLS 1.3 standard was released and DTLS 1.3 is in thefinal stages of standardization. In this paper, we give an overview of version1.3 of these protocols, and we provide the first experimental comparativeperformance analysis of different implementations and various configurations ofthese protocols, on real IoT devices based on low-power microcontrollers. Weshow how different implementations lead to different compromises. We measureand compare bytes-over-the-air, memory footprint, and energy consumption. Weshow that, when DTLS/TLS 1.3 requires more resources than DTLS/TLS 1.2, thisadditional overhead is quite reasonable. We also observe that, in someconfigurations, DTLS/TLS 1.3 actually decreases overhead and resourceconsumption. All in all, our study indicates that there is still room tooptimize the existing implementations of these protocols.

Low-Power IoT Communication Security: On the Performance of DTLS and TLS 1.3