[tor-bugs] #8240 [Tor]: Raise our guard rotation period

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#8240: Raise our guard rotation period
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     Reporter:  arma     |      Owner:
         Type:  defect   |     Status:  new
     Priority:  major    |  Milestone:  Tor: 0.2.???
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  tor-client needs-proposal
Actual Points:           |  023-backport unfrozen
       Points:           |  Parent ID:
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Comment (by asn):

 To share Mike's concerns here, I had a long discussion with Paul about
 this during the latest dev meeting. He feels that increasing the guard
 lifetime to 9 months makes certain attacks much more plausible.

 This is especially the case for hidden services, where guard discovery
 attacks are easy. I feel persuaded that we should plug these attacks, or
 make them harder to succeed, before increasing the lifetime here.

 He was also afraid of the effects of this to regular Tor clients as well,
 since after we moved from 3 to 1 guard, the middle nodes can link clients
 to  their guards more reliably. He is afraid that this might allow
 profiling of specific users, etc.

 I think all the above means, "more research is required".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8240#comment:42>
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