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Re: [quicwg/base-drafts] Are random packet number skips still relevant for opportunistic ACK protection? (#1030)

janaiyengar <notifications@github.com> Fri, 12 January 2018 22:16 UTC

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Subject: Re: [quicwg/base-drafts] Are random packet number skips still relevant for opportunistic ACK protection? (#1030)
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@marten-seemann : This optimistic ack attack was one of the motivating reasons for entropy in the old GQUIC. We eventually agreed internally that this wasn't an interesting attack... looking through past work and asking around made it clear that this potential vector, which is present in TCP as well, wasn't interesting enough to be exploited.

But, as you note, a sender can always skip a packet number just to test. This doesn't have to be co-ordinated with the receiver, and it needs skipping only a single packet number.

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