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Re: [tor-bugs] #23420 [Core Tor/Tor]: prop224: Pad RENDEZVOUS1 cell to match legacy cell length
#23420: prop224: Pad RENDEZVOUS1 cell to match legacy cell length
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Reporter: asn | Owner: dgoulet
Type: defect | Status: needs_review
Priority: Medium | Milestone: Tor:
| 0.3.2.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: prop224, prop224-extra, tor-hs | Actual Points:
Parent ID: | Points: 1
Reviewer: | Sponsor:
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Comment (by asn):
OK. Based on the thread from comment:4 :
- Ian pointed out that just padding with random bytes is not the right
approach since the `g^y` field of the legacy cell has certain algebraic
structure that will be missing from the random pad. We could in theory add
intelligent padding that matches the algebraic structure, but kinda
overkill perhaps.
- teor pointed out that there are other distinguishers between v2 and v3,
like whether the service extends with tap vs ntor.
We ''could'' do naive padding in v3, but only with the hope that it would
obfuscate future cells (v4, etc.).
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23420#comment:5>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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