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|    alt.privacy    |    Discussing privacy, laws, tinfoil hats    |    112,125 messages    |
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|    Message 111,763 of 112,125    |
|    Anonymous to nobody@dizum.com    |
|    Re: Are replay attacks possible in a.a.m    |
|    19 Oct 25 13:50:03    |
   
   [continued from previous message]   
      
   'Hamster' log list. First it creates resp. updates internal reports,   
   then, after a while, as per specification at the next quarter of an   
   hour, it starts to download 'alt.anonymous.messages' articles from the   
   'news.mixmin.messages' server already mentioned above.   
      
   This is also done using the OmniMix NNTP proxy server, so that Hamster   
   isn't exposed to the Internet. The download process may take some time   
   depending on the 'Pull Limit First' value, which describes the number of   
   latest articles to retrieve when doing so for the first time. From then   
   on all articles are downloaded, as defined in 'Pull Limit Later' ('0').   
      
   To activate Hamster parameter changes shut down Hamster, press the   
   'Update Hamster Configuration' button at the 'Hamster' > 'Config' tab,   
   then restart Hamster. That's also the place where you define the   
   connection parameters of Hamster's NNTP server. If you change the port   
   number take care that it doesn't collide with other services, esp.   
   OmniMix.   
      
   At Hamster's 'Groups' tab you can even specify the set of newsgroups   
   Hamster has to stock. The integration of further groups beyond   
   alt.anonymous.messages may once become relevant with an increasing   
   number of nym reply postings exceeding the client's download capacity.   
   Be aware that with an increasing amount of data stored in Hamster a   
   restart may take longer than OmniMix tries to connect, as auxiliary   
   files have to be rebuilt. If that happens try to connect manually by   
   clicking 'Connect' at the 'Hamster' > 'Run' tab.   
      
   As you see on the 'NwsNym' > 'Server' tab OmniMix is already configured   
   to get nym replies from Hamster, so apart from starting that server   
   nothing has to be done to provide mail clients with their messages.   
      
   Of course with a local newsgroup depository countermeasures against   
   adversaries as described above aren't required. So keep them deactivated   
   at the 'NwsNym' > 'Access' tab.   
      
   With the decoding of nym replies OmniMix preserves the headers of the   
   'envelope' message by preceding the header names with the character   
   sequence 'O-Nym-'. The introducing 'O-Nym-Crypto:' line is a matter of   
   particular interest, as it offers you some information about the   
   decryption process, which were the reply block slot ('slot='), the   
   number of symmetric ('sym=') and asymmetric decryption stages ('asym='),   
   the subject encoding method ('esub=') used with that message ('p' for   
   plain unencrypted subject, 'i' for esub/IDEA, 'b' for bsub/Blowfish, 's'   
   for hsub/SHA256) and the respective nym account ('account='). The   
   'O-Nym-Sig:' header indicates whether the message's nym server signature   
   is valid.   
      
   So as an answer for a configuration request you have to expect something   
   like   
      
   ------------------------------------------------------------------------   
   O-Nym-Crypto: slot=3; sym=4; asym=1; esub=i;   
   account=whopper@nym.mixmin.net   
   O-Nym-Sig: Good signature (RIPEMD160:[562619C278247C3B] Bananasplit   
   Pseudonym Server (Bananasplit Pseudonymous Email Server)   
   
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