There are some easy ways of hiding information from prying eyes :

• Use rot13 transformation for each line of the file (A -> N, B -> O
• Use compress to compress and decompress the file
• Use MIME to encode the file as a Base64 encoded file

1. read the file
2. decode the data
3. process the data
4. encode the data
5. rewrite the complete file

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
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