[tor-bugs] #1839 [BridgeDB]: Rotate available bridges over time

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#1839: Rotate available bridges over time
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 Reporter:  arma         |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:     
Component:  BridgeDB     |     Version:     
 Keywords:               |      Parent:     
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 We need to design a new algorithm for deciding which bridge addresses to
 give out in response to a given query. The result of this algorithm should
 be that only a small fraction (e.g. 20%) of the bridges in the https or
 gmail bucket are available at a given time, and we rotate to a new
 fraction each week.

 Benefits: a) an adversary who does a high-intensity push to enumerate
 bridges can't get them all in one week now matter how hard the push, and
 b) if you learned your bridge last week, the enumerating adversary won't
 find it this week.

 This task depends on #1606 (bridgedb spec), since I don't have a good
 handle on what we're doing now, so I don't know what needs to change to
 get there.

 And finally, we're going to need to improve Vidalia's "who has used my
 bridge" interface to explain to the users what's going on, so they don't
 see zero usage and turn off their bridge.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1839>
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