#!/usr/bin/perl
## z340crack written by Bowie J. Poag
##
## This script attempts to brute-force crack Quadrant 3 of the Zodiac killer's "Z340" cipher.
##
$|=1;
## 1 = Backward B
## 2 = Left half filled circle
## 3 = Filled P
## 4 = Filled circle
## 5 = Backward C
## 6 = Circle with vertical line
## 7 = Butt, left dimple
## 8 = Filled triangle
## 9 = Backward P
## = = Upside-down T
## # = Backward F
## % = Backward Q
## & = Top half filled circle
## : = Backward L
## ; = Circle with horizontal line
## ' = / Forward slash
## { = Square
## } = Southwest filled square
## _ = Caret
## X = Plus sign
## ] = Dot
##
##
## Ciphertext block:    YB91TMKO
##                      T2M]X3BF
##                      4FB5678R
##                      1]5V2=XX
##                      E>VUZ4-X
##                      9_]#M%G&
##                      XF:WBI;L
##                      OSHT'6;9
##                      {YOB}-C5
##                      ZO8AIK7X
##
##                      

##
## One liner:  YB91TMKOT2M]X3BF4FB5678R1]5V2=XXE>VUZ4-X9_]#M%G&XF:WBI;LOSHT'6;9{YOB}-C5ZO8AIK7X
##



$z=0;

while ($z>=0)
{
        $#table=-1;

        $normalAlphabet="abcdefghijklmnopqrstuvwxyz";
        $zodiacAlphabet="=>_-;:']{}&#%123456789ABCEFGHIKLMORSTUVWXYZ";
        $cipherText="YB91TMKOT2M]X3BF4FB5678R1]5V2=XXE>VUZ4-X9_]#M%G&XF:WBI;LOSHT'6;9{YOB}-C5ZO8AIK7X";

        $oldZ=$zodiacAlphabet;

        $x=0;

        while($x<100)  ### Scramble the alphabet so that symbol selection is random. 100 iterations should do.
        {

                $offset=int(rand(length($zodiacAlphabet))); ## Pick a symbol somewhere in the string..
                $offset--;
                $splitter=substr($zodiacAlphabet,$offset,1);
                $zodiacAlphabet=~/$splitter/;
                $zodiacAlphabet=$'."$splitter".$`; # Swap the right half and the left half of the match..
                $x++;
        }

        $x=0;

        while ($x<length($zodiacAlphabet))
        {
                $l=length($zodiacAlphabet);
                $thisSymbol=substr($zodiacAlphabet,$x,1);
                $letter=int(rand(length($normalAlphabet)));
                $table[$letter].="$thisSymbol";
                $x++;
        }

        ## The table has now been built. All letters in the normal alphabet now have a random number of zodiac symbols assigned to them.

        $x=0;
        $x=0;
        $y=0;


        while ($x<length($normalAlphabet)) ## For every letter of the normal alphabet, replace the symbols assigned to it in the cipher.
        {
                $thisLetter=substr($normalAlphabet,$x,1);

                $y=0;

                while($y<length($table[$x]))
                {
                        $thisSymbol=substr($table[$x],$y,1);
                        $cipherText=~s/$thisSymbol/$thisLetter/g;
                        $y++;
                }

                $x++;
        }

        $z++;

        ## Look for pay dirt..
        ## The misspellings here are intentional, taken from known exmaples
        ## of the Zodiac killer's previous writings. A match on any of these
        ## words would be a hint of a significantly stronger "signal" among
        ## the noise.

        @signalWords=("children","others","around","shall","about","people","would","missed","police","because","thing","there","could","rather","light","school","vallejo","useing","triger","howers","cerous","meannie","killed","victom","speaking","lyeing","slaves","afterlife","zodiac","intersting","idenity","woeman","untill");


        foreach $signal (@signalWords)
        {
                if ($cipherText=~/$signal/)
                {
                        $signalValue++;
                        $signalsFound.=" $signal";
                }


        }

        if ($z%9==0)
        {
                print "Processing: Pass #$z [$cipherText]\r";
        }

        if ($signalValue>=3)
        {
                print "\n\n\nMATCH FOUND: $cipherText (Count: $signalValue, $signalsFound ), cycle $z\n\n";

                open (FILE,">>/tmp/zodiac.txt");
                print FILE "\n\n\nMATCH FOUND: $cipherText (Count: $signalValue, $signalsFound ), pass $z\n\n";


                $x=0;

                while ($x<length($normalAlphabet))
                {
                        $thisLetter=substr($normalAlphabet,$x,1);
                        print "\t$thisLetter equals ($table[$x])";
                        print FILE "\t$thisLetter equals ($table[$x])";
                        if ($x%4==0 && $x>0)
                        {
                                print "\n";
                                print FILE "\n";
                        }
                        $x++;
                }

        close (FILE);

        print "\n\n";

        }

        $signalValue=0;
        $signalsFound="";
        $signal="";

}