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[quicwg/base-drafts] Improve ACK_ECN frame encoding (e.g., use bit-vector) (#1439)

Kazuho Oku <notifications@github.com> Tue, 12 June 2018 01:08 UTC

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From: Kazuho Oku <notifications@github.com>
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Subject: [quicwg/base-drafts] Improve ACK_ECN frame encoding (e.g., use bit-vector) (#1439)
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The encoding of ACK_ECN frame (proposed in #1372) has following issues.

* size of ACK_ECN frame becomes bigger as more and more packets are exchanged, since the counters represent the total number of packets being exchanged using the connection
* requires the receiver of the ACK_ECN frames to detect duplicates to avoid duplicate packet injection attacks
* does not have full protection against duplicate packet injection attacks, since detection on the receiver cannot be deterministic

As discussed in Kista, these issues are not blockers for merging #1372, but we might want to consider adopting different encoding scheme to address them.

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