Planning: 20 mins
Coding: 10 mins
Formatting: 90 mins!

At least it killed time on a long flight! 

                $_="Who am I?";
            my@f=unpack("C*",$_);
          $f[9]=$f[3]+$f[6]+$f[7]-
      $f[8];$f[25]=$f[5]-$f[9]+$f[7]
     ;$f[10]=$f[2]+$f[2]-$f[1]-$f[9]+
   $f[7];$f[17]=     $f[12]=$f[10]+
   $f[7]-$f[9];      $f[11]=$f[12]
                    +$f[7]-$f[9];
                   $f[26]=$f[21]
                  =$f[13]=$f[3]
                 ;$f[28]=$f[14]
                =$f[3]+$f[6]+
               $f[13]-$f[7]
               +$f[9];$f[15]
               =$f[5]+$f[9]
                -$f[7];$f[16]
                  =$f[2];$f[27]

                       =$f[18]=         $f[1];$f         [31]=$f[
                      23]=$f[19]=$     f[2]-$f[4]+$     f[0];$f[32]
                      =$f[24]=$f[20]   =$f[11]+$f[7]-   $f[9];$f[22]=
                       $f[10]+$f[10]    +$f[10]-$f[0]   -$f[0]-$f[14]
                        ;$f[29]=$f[4     ]+$f[10]-$f[    11];$f[30]=$
                          f[10]+$f[        0]-$f[4];       print pack
                             ("C*"            ,@f[9           ..32]);

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In reply to First JAPH by johnlawrence

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