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  o Security Features:
    - Provide controllers with a safer way to implement the cookie
      authentication mechanism. With the old method, if another locally
      running program could convince a controller that it was the Tor
      process, then that program could trick the contoller into
      telling it the contents of an arbitrary 32-byte file. The new
      "SAFECOOKIE" authentication method uses a challenge-response
      approach to prevent this. Fixes bug 5185, implements proposal 193.