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authorRasmus Dahlberg <rasmus.dahlberg@kau.se>2021-11-16 21:44:20 +0100
committerRasmus Dahlberg <rasmus.dahlberg@kau.se>2021-11-16 21:44:20 +0100
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+Date: 2021-11-16, 1300 CET
+Meet: https://meet.sigsum.org/sigsum
+Chair: rgdd
+
+Agenda
+ * Hello
+ * Status round
+ * Discuss
+ * Next steps
+
+Hello
+ * rgdd
+ * ln5
+ * rohonk
+
+Status round
+ * [rgdd et al.] brief summary of in-person meet last week
+ * https://git.sigsum.org/sigsum/tree/archive/2021-11-16-in-person-meet-pad
+ * [rgdd] proposal: open-ended shard interval
+ * https://git.sigsum.org/sigsum/tree/doc/proposals/2021-11-open-ended-shard-interval.md
+ * [rgdd] proposal: remove arbitrary bytes in leaf structure
+ * https://git.sigsum.org/sigsum/tree/doc/proposals/2021-11-remove-arbitrary-bytes.md
+ * [ln5] proposal: use SSH signing format for leaves and tree heads
+ * https://git.sigsum.org/sigsum/tree/doc/proposals/2021-11-ssh-signature-format.md
+ * [rohonk] looking into possible proof methods, like formal verification with Tamarin
+
+Discuss
+ * Update meeting structure?
+ * Hello, status round, decisions, next steps?
+ * "More focused meeting, discuss more after and/or async"
+ * "Max 50 minutes, probably less"
+ * Decision: rgdd will propose an updated meeting structure
+ * Life cycle for documents in doc/proposal
+ * Keep? Merge into main docs? Annotate aborted, implemented, etc?
+ * Decision:
+ * Keep proposal files
+ * Add a status line if helpful, e.g., "implemented, "aborted", etc.
+ * Move relevant parts of proposal to main documentation if status "implement"
+ * Use SSH signing format for leaves and tree heads
+ * Expand on changes to api endpoints in api.md
+ * Expand on output from openssh tooling
+ * Include that proposal includes switching from Ed25519 -> Ed25519ph w/ SHA256
+ * Open questions
+ * Move shard hint from struct statement to namespace field in SSH signed data?
+ * (In particular, would that make the signing procedure easier or not?)
+ * Some agility, but should be separate and not part of this proposal
+ * Security proof
+ * Q: Consider possible vulnerabilities in algorithms as part of security proof?
+ * No, security analysis of protocol so assume e.g. signature scheme with prop X
+ * Q: Would it be a good idea to use a formal tool like Tamarin/Proferif?
+ * Maybe, this paper might be helpful for rohonk to explore that possibility:
+ * https://people.cispa.io/cas.cremers/downloads/papers/ccsfp200s-cremersA.pdf
+ * Step 1: parameters, setup, properties to prove
+ * Step 2: select proof method, could be tamarin or something else like pen&paper
+ * Decisions about any open design TODOs?
+ * See above proposals
+ * See (3) in deferred item from in-person meet
+ * Also need to think about better terminology for "signer" and "verifier"
+ * Defer until next week, everyone reads in advance to be prepared
+
+Next steps
+ * [everyone] read and think about open design TODOs
+ * [ln5] ssh signing format proposal, and give rgdd access to sigsum systems
+ * [rgdd] propose updated meeting structure
+ * [rohonk] continued work on security proof and proof techniques
+
+Other useful links
+ * [kfreds] brief intro to singing with ssh tooling
+ * https://www.agwa.name/blog/post/ssh_signatures