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Encryption of X-Trace and NNTP-Posting-Host

To preserve your privacy the header fields X-Trace and NNTP-Posting-Host are encrypted using the algorithm below. In return we add the encrypted field X-User-ID. Our setup has a few implications:

Thoughts on key length (German)
Schnuerpel::Crypt.pm
Schnuerpel::INN::Filter.pm
filter_nnrpd.pl

The software can be downloaded through subversion:

svn co svn://svn.schnuerpel.eu/schnuerpel/trunk