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+ o Major features (security):
+ - Change the algorithm used to decide DNS TTLs on client and server side,
+ to better resist DNS-based correlation attacks like the DefecTor attack
+ of Greschbach, Pulls, Roberts, Winter, and Feamster). Now
+ relays only return one of two possible DNS TTL values, and clients
+ are willing to believe DNS TTL values up to 3 hours long.
+ Closes ticket 19769.