Okay. Here's an open challenge to all crypto-analysts everywhere.

Modify the following text

The quick brown fox jumps over the laxy dog f67fcc68ecf72971a7bd012e3a47d0ac

such that it will verify by the following perl program:

#! perl -slw
use strict;
use Digest::MD5 qw[ md5_hex ];

my $challenge = 
'The quick brown fox jumps over the laxy dog f67fcc68ecf72971a7bd012e3
+a47d0ac';

my( $text, $sig ) = $ARGV[ 0 ] =~ m[(^.*)\s(.{32})$];

die 'Cheat! The text has to be different'
    if $ARGV[ 0 ] eq $challenge;

die 'Bad luck'
    if  md5_hex( $ARGV[ 0 ] ) ne '7b79a6f61178415a63fc5e7b76d64a1f'
    or md5_hex( $text ) ne $sig;
    
print "You won yourself a meal on BrowserUk" ;

print 'Make sure your passport is valid'
    if $ARGV[ 0 ] =~ m[lazy];
    
__END__
[download]

anytime in my remaining lifetime, and I'll stand them a meal at their favorite restuarant.

Pad or truncate the message as necessary, but correct my typo and I'll stand them a meal at my favorite restuarant.

And pick up the tab for getting them to and from it.