Feature Requests item #1735020, was opened at 2007-06-11 13:50
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Category: None
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: Steve Crook (zaxuk)
Assigned to: Nobody/Anonymous (nobody)
Summary: Include PGP Comments Header
Initial Comment:
Users of Type-I Pseudonyms often terminate them on the Usenet group
alt.anonymous.messages. Many of these are being lost due to news servers
running default Cleanfeed installations that perform 'Fuzzy MD5' to filter
Excessive Multi-Posting.
Cleanfeed's Fuzzy MD5 performs the following filtering prior to hashing the
message payload:
$mbody = lc $hdr{__BODY__};
$mbody =~ s/^(?!http)\S{7,70}\r?$//mg;
$mbody =~ s/\r{3}.*$//mg;
$mbody =~ s/\s+$//;
$mbody =~ s/^[^\n]*\Z//m if $lines > 5;
$mbody =~ tr/a-z0-9//cd;
This results in virtually all PGP encrypted messages having the same MD5 hash
and subsequently being dropped.
Resolution:
During encryption, add a PGP Comments header that contains 8 blocks of 6 random
a-z characters separated by a whitespace character. This will ensure that each
PGP payload will generate a different Fuzzy MD5 hash.
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