Session Date/Time: 07 Nov 2022 13:00

core

Summary

The core working group met at IETF-115 to discuss several drafts, including updates on href, conditional attributes, a new Target attribute registry, group OSCORE, profiling ADHOC for CoAP/OSCORE, key update for OSCORE/Kudos, DNS over CoAP, and encoding DNS messages in CBOR. Key discussions revolved around extensibility of URI scheme registries, security considerations for group OSCORE, and the trade-offs between complexity and optimization in DNS message encoding. Several documents are nearing working group last call.

Key Discussion Points

href (Concise URI References):
- Discussed the extensibility of scheme ID registries for URIs, with a focus on pre-filling the registry and coordinating with the IANA URI scheme registry. The idea of adding a column for Cris number was presented.
- Concerns were raised on whether there should be a central or decentralized registry approach.
- Test vectors were planned for the appendix.
Conditional Attributes:
- The document is in working group last call.
- One open issue remains requiring minor code review.
- Discussion on requesting an early review from the IoT Directorate.
Target Attribute Registry:
- The draft proposes a new sub-registry for Target attributes in the core parameters registry.
- Expert review policy was discussed, along with guidance for designated experts.
- Discussion about whether the attributes pertain to the link or to the link target and possible ways to handle that.
- The usefulness of supporting pointers to external specifications was presented.
Group OSCORE:
- Updates on handling multiple responses and security properties.
- A new target attribute, GOSK, was proposed.
- Discussion about unifying the handling of notifications and other requests for multiple responses.
Profiling ADHOC for CoAP/OSCORE:
- Discussion on the performance benefits of the optimized workflow vs the original edoc workflow.
- Target attributes for added resources will be registered in the new Target attribute registry.
- Proposal to include a response to the edit message tree.
Key Update for OSCORE/Kudos:
- Updates on the Kudos procedure, key usage limits, and updating OSCORE IDs.
- Concerns regarding added complexity and need to signal protocol features.
- Server must include a partial AV in responses.
- Discussion about splitting the document into separate parts.
DNS over CoAP:
- Discussion on various concerns with using CoAP to handle DNS requests and their associated benefits and drawbacks.
- Proposed solutions to common issues.
- Discussion on whether it needs a default path and if so what its default value should be.
Encoding DNS Messages in CBOR:
- Proposal to reduce DNS message sizes by encoding in CBOR.
- Discussion around existing alternative DNS formats and ways to avoid existing problems.
- Concerns raised about ossification and the challenges of ensuring future extensibility.

Decisions and Action Items

href: Work on dash 12, do working group last call, address the comments and suggestions and include test vectors.
Conditional Attributes: Complete the remaining issue, welcome more reviews, and request an early review from the IoT directorate.
Target Attribute Registry: Start a working group adoption call.
Group OSCORE: Submit version 17, adding the new Target attribute and wait for input and review.
Profiling ADHOC for CoAP/OSCORE: Initiate working group last call.
Key Update for OSCORE/Kudos: Hard split of the limits for now. The rest will be discussed in a future meeting.
DNS over CoAP: Address the feedback provided and pick an ID for the application DNS message for Content format.
DNS CBOR: Revise the format based on the feedback. Propose the work to DNSOP and revise the format based on their input.

Next Steps

Next interim on November 23rd to cover hrefs and Target attributes.
Continue discussions on mailing lists for open issues.
Francesca to send email regarding errata agreement.