[quicwg/base-drafts] secdir review of -qpack; issue 11 (#4399)

[Lars Eggert <[e-mail]>]

Magnus Nystrom [wrote](https://datatracker.ietf.org/doc/review-ietf-quic-qpack-19-secdir-lc-nystrom-2020-11-19/):
>  - The security considerations section is well written, but the attack
   scenario of "mutual distrustful parties" is unclear to me. One stated
   scenario is where multiple client connections aggregate at an intermediary
   that then maintains a single connection to an origin server. Another stated
   scenario is where multiple origin servers connect to an intermediary which
   then serves a client. In these scenarios, is the concern that the
   intermediary may control either a client or an origin server and thus would
   be able to leverage the compression context at, say, a second client and
   then observe (as the intermediary) the result of a guess for a field tuple?
   It may be helpful to explain this in a little more detail.


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