#30092: Add a probability-to-apply field for circuitpadidng machines
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Reporter: mikeperry | Owner: (none)
Type: enhancement | Status:
| needs_revision
Priority: Medium | Milestone: Tor:
| 0.4.1.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: wtf-pad, tor-relay, tor-cell, | Actual Points: 0.5
padding, 041-proposed |
Parent ID: #28634 | Points: 2
Reviewer: asn | Sponsor:
| Sponsor2-can
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Comment (by asn):
BTW as a more general comment in this ticket, we should think a lot before
we use this feature because the overhead danger is high (depending on the
probability) and reaping the benefits is not always as straightforward.
For example, consider using this feature for ticket #28634 to make general
circuits look more random and blend in with random-lookin HS circuits. In
that case, it's true that we increase the false positive rate of
identifying a single intro or rend circuit, but if you look at the whole
HS circuit dance, you can see that an HS client starts using 2 circuits at
the same time (intro and rend, let's ignore hsdir for now). This ticket
won't make normal clients start using 2 circuits at once, so even tho a
single circuit might look random if the `probability` triggers, the fact
that it's missing the second circuit might still act as an identifier in
that the session is not actually an HS dance and it's faking it.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30092#comment:7>
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