  The emerging Internet of Things (IoT) challenges the end-to-end transport of
the Internet by low power lossy links and gateways that perform protocol
translations. Protocols such as CoAP or MQTT-SN are degraded by the overhead of
DTLS sessions, which in common deployment protect content transfer only up to
the gateway. To preserve content security end-to-end via gateways and proxies,
the IETF recently developed Object Security for Constrained RESTful
Environments (OSCORE), which extends CoAP with content object security features
commonly known from Information Centric Networks (ICN).
  This paper presents a comparative analysis of protocol stacks that protect
request-response transactions. We measure protocol performances of CoAP over
DTLS, OSCORE, and the information-centric Named Data Networking (NDN) protocol
on a large-scale IoT testbed in single- and multi-hop scenarios. Our findings
indicate that (a) OSCORE improves on CoAP over DTLS in error-prone wireless
regimes due to omitting the overhead of maintaining security sessions at
endpoints, and (b) NDN attains superior robustness and reliability due to its
intrinsic network caches and hop-wise retransmissions.
