README.md

Rotten

PROBLEM

Head over to the link below to find the flag. Link

SOLUTION

Since nothing is given to first thing we check out is the source of theh page and what we see is:

 document.getElementById("check").onclick = function () {
 var flag = document.getElementById("flag").value;
 var rotFlag = flag.replace(/[a-zA-Z]/g, function(c){
 return String.fromCharCode((c <= "Z" ? 90 : 122) >= (c = c.charCodeAt(0) + 13) ? c : c - 26);});
 if ("TYHT{py13a7_51q3_y061a_j17u_e0713!}" == rotFlag) {
 alert("Correct flag!");
 } else {
 alert("Incorrect flag, rot again");
 }
 }

And here we can see that entered value is compared with TYHT{py13a7_51q3_y061a_j17u_e0713!}. Okay but this is not the correct flag, hey what was the name of the problem rotten? Well is that string encoded with rot13. We head over to this and gets our prize.

FLAG - GLUG{cl13n7_51d3_l061n_w17h_r0713!}