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(ROT-13解密)Flare-On4: Challenge1 login.html

说是FlareOn的逆向 倒不如说是crypto.......

题目不难 F12看源码:

            document.getElementById("prompt").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 ("PyvragFvqrYbtvafNerRnfl@syner-ba.pbz" == rotFlag) {
                    alert("Correct flag!");
                } else {
                    alert("Incorrect flag, rot again");
                }
            }
        

很明显是个ROT-13加密

然后照着他的js代码改了一个rot13解密的py脚本(Python弱如狗的我踩了很多坑),妈妈再也不用担心我的rot13解密:

rotflag = 'PyvragFvqrYbtvafNerRnfl@syner-ba.pbz'
flag=''
n=0
s=0
for i in rotflag:
    if (i<='Z' and i>='A') or (i<='z' and i>='a'):
        i=(ord(i)+13) if ((90 if(i <= 'Z')  else 122) >= (ord(rotflag[n]) + 13) ) else (ord(i) - 13)
        flag+=chr(i)
    else:
        flag+=i
    n+=1
print(flag)

 

posted @ 2019-06-14 00:58  WinterFa1L  阅读(455)  评论(0编辑  收藏  举报