Re: [quicwg/base-drafts] No need for RCID if the peer increases Retire Prior To (#3550)

Kazuho Oku <notifications@github.com> Sat, 28 March 2020 23:42 UTC

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Subject: Re: [quicwg/base-drafts] No need for RCID if the peer increases Retire Prior To (#3550)
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I think that the change by itself would not be a bad idea, though I would point out that an endpoint still needs to restrict the number of CIDs sent using RCID, to protect itself from the other attack that uses migration as the attack vector (#3509 (comment)).

The beauty of #3547 is that it provides a unified way of defending against the attacks (by allowing and endpoint to limit the stack it uses for tracking RCIDs). Compared to that, this PR would require two mitigations: limit the state _and_ special-case for handling RPT.


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