9004_codemash_tshirt

scanning the qr code results in the text:

<script>
   var solution = 'QELMX';
   var a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
   var b = "ZYTSRQFEDCPONMLXWVUKJIHGBA";
   var r = "";
   for (i = 0; i < solution.length; i++) {
      r += b.charAt(a.indexOf(solution.charAt(i)));
   }
   alert("MY NAME IS: " + r);
</script>

executing the scripts results in MY NAME IS: WRONG
- most likely not the solution ;)
the "solution string" that "produces" "my name" is: QELMX (but this seems to be too easy as well.?)
- assumption: we are searching the solution string that produces my real name (ROBERT)

invert the algorithm to construct the solution string from the name:

<script>
   var name = "ROBERT"
   var a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
   var b = "ZYTSRQFEDCPONMLXWVUKJIHGBA";
   var r = "";
   for (i = 0; i < name.length; i++) {
      r += a.charAt(b.indexOf(name.charAt(i)));
   }
   alert("THE SOLUTION IS: " + r);
</script>

(b.charAt(a[...]) to a.charAt(b[...]) and replacing solution with name)

execute the inversion to get alerted with THE SOLUTION IS: ELYHEC

name: ROBERT
solution: ELYHEC