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@@ -329,3 +329,20 @@ Status: Open
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Once proposal 124 (modified TLS handshake) is in place, we should
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consider doing the switch. This might even be in the 0.2.0.x timeframe.
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+3.8. Do we need a second layer of entry guards?
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+
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+ If the bridge user uses the bridge as its entry guard, then the
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+ triangulation attacks from Lasse and Paul's Oakland paper work to
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+ locate the user's bridge(s).
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+
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+ Worse, this is another way to enumerate bridges: if the bridge users
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+ keep rotating through second hops, then if you run a few fast servers
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+ (and avoid getting considered an Exit or a Guard) you'll quickly get
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+ a list of the bridges in active use.
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+
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+ That's probably the strongest reason why bridge users will need to
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+ pick second-layer guards. Would this mean bridge users should switch
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+ to four-hop circuits?
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+
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+ We should figure this out in the 0.2.1.x timeframe.
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+
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Roger Dingledine