[tor-dev] Issues With Ticket #7532 - "Count unique IPs in an anonymous way"

Andreas Krey a.krey at gmx.de
Tue Mar 28 21:40:59 UTC 2017

On Tue, 28 Mar 2017 13:24:15 +0000, samir menon wrote:
> IPv6 also solves this (128 bits), but there again, the solution is just to
> hash the IP's before storing them

No even that. Once you forget the salt the stored-so-far addresses
become useless for you, too. So instead of storing current salt
plus hashed addresses you can just as well store plain addresses
for the day (modulo cost of the hash function).

> - the Bloom filter

Indeed. You can preload some random addresses into the hash set
just as well as into the bloom filter, to 'poison' the cache.

- Andreas

"Totally trivial. Famous last words."
From: Linus Torvalds <torvalds@*.org>
Date: Fri, 22 Jan 2010 07:29:21 -0800

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