[tor-bugs] #23420 [Core Tor/Tor]: prop224: Pad RENDEZVOUS1 cell to match legacy cell length
Tor Bug Tracker & Wiki
blackhole at torproject.org
Wed Sep 20 12:06:50 UTC 2017
#23420: prop224: Pad RENDEZVOUS1 cell to match legacy cell length
--------------------------------------------+------------------------------
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:
--------------------------------------------+------------------------------
Comment (by nickm):
So, IIUC, the "algebraic structure" in question here is just that real
values of g^y^ will always be between 2 and p-1 (inclusive). But since p
is very close to 2^1024^, nearly all values will pass that test. (Random
junk will fail with probability approximately 2^-66^.)
The tap/ntor argument is stronger.
On the other hand, just padding with random bytes costs us almost nothing.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23420#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
More information about the tor-bugs
mailing list