Reviewer: Eric Vyncke Review result: ok minor issue (key renewal) I have been asked to review draft-ietf-lwig-crypto-sensors-05 on behalf of the Ops Directorate. This informational draft is about the challenges associated with securing resource-constrained smart object devices (such as those using CoAP). It describes a possible deployment model and some preliminary experiences. It is part of a set of documents (draft- arkko-core-security-arch). The challenges section includes many operational aspects: provisioning, scalability, ... The document proposes a simple system to generate the device identity based on its public key. The authors made some tests using 6 different crypto-libraries on Arduino 8-bit processors, this is the main part of the document. Finally, sections 7 and 8 describe a simple test application and some considerations about implementations. So, a rather practical document. *My only regret is that ‘key pair renewal’ is mentioned twice in the document (section 4.1 and 8.1) but without any detail... Key renewal is a big operational issue and it deserves more text or be explicitly cited as a non-goal in the abstract.* Final note, I enjoyed reading the document -éric