Thanks for the criticism! I've not played many cryptograms, so I wasn't familiar with that idea. I wouldn't have called it a "complete shuffle" though. An "incomplete shuffle", maybe :)

I've added a bit to my shuffling function to ensure a derangement. It's a bit quick and dirty... 
sub gen_random_key{
    ####sub fisher_yates_shuffle {
    my @array = split ("", $alpha);
    my @alpha = @array;
    for (my $i = @array; --$i; ) {
        my $j = int rand ($i+1);
        next if $i == $j;
        @array[$i, $j] = @array[$j, $i];
    }
    for (0..$#alpha){
        $decrypt{$alpha[$_]} = $array[$_];
        $encrypt{$array[$_]} = $alpha[$_];
    }
    #ensure a derangement
    for (0..$#alpha){
        if ($alpha[$_] eq $array[$_]) {
            gen_random_key();
            #warn 'key not deranged, setting another..';
            return;
        }
    }
}

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In reply to Re^2: quick and dirty cryptogram puzzle by Snarius
in thread quick and dirty cryptogram puzzle by Snarius

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