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Tor and DNS attacks


I just wondered if Tor might be vulnerable to DNS attacks during the bootstrapping phase? Is there a public key of a directory server included in all the Tor download packages to secure the initial contact to the directory servers?

I also want to emphasize again that everybody, but especially Tor node operators, should check that he/she is not vulnerable to DNS cache poisoning, for example by visiting this website:
or by querying the TXT record of the domain porttest.dns-oarc.net with a command like 'host -t TXT porttest.dns-oarc.net'.


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