Iam Legend

If I am a legend, then why am I so lonely?

Link: http://35.193.45.56/iamlegend/

Solve:

Steps

View the page source we will notice the following:
```
  <script>[][[[]+[][+[]]][+[]][...</script>
```

Deobfuscate the js code from deobfuscatejavascript.com:

  String.fromCharCode(102, 117, 110, 99, 116, 105, 111, 110, 32, 99, 104, 101, 99, 107, 40, 41, 123, 10, 10, 118, 97, 114, 32, 117, 115, 101, 114, 32, 61, 32, 100, 111, 99, 117, 109, 101, 110, 116, 91, 34, 103, 101, 116, 69, 108, 101, 109, 101, 110, 116, 66, 121, 73, 100, 34, 93, 40, 34, 117, 115, 101, 114, 34, 41, 91, 34, 118, 97, 108, 117, 101, 34, 93, 59, 10, 118, 97, 114, 32, 112, 97, 115, 115, 32, 61, 32, 100, 111, 99, 117, 109, 101, 110, 116, 91, 34, 103, 101, 116, 69, 108, 101, 109, 101, 110, 116, 66, 121, 73, 100, 34, 93, 40, 34, 112, 97, 115, 115, 34, 41, 91, 34, 118, 97, 108, 117, 101, 34, 93, 59, 10, 10, 105, 102, 40, 117, 115, 101, 114, 61, 61, 34, 67, 121, 98, 101, 114, 34, 32, 38, 38, 32, 112, 97, 115, 115, 61, 61, 32, 34, 84, 97, 108, 101, 110, 116, 34, 41, 123, 97, 108, 101, 114, 116, 40, 34, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 67, 111, 110, 103, 114, 97, 116, 122, 32, 92, 110, 32, 70, 108, 97, 103, 58, 32, 123, 74, 52, 86, 52, 95, 83, 99, 114, 49, 80, 116, 95, 49, 83, 95, 83, 48, 95, 68, 52, 77, 78, 95, 70, 85, 78, 125, 34, 41, 59, 125, 32, 10, 101, 108, 115, 101, 32, 123, 97, 108, 101, 114, 116, 40, 34, 119, 114, 111, 110, 103, 32, 80, 97, 115, 115, 119, 111, 114, 100, 34, 41, 59, 125, 10, 10, 125)

Using python interpreter to parse the dec values to ascii:

  >> dec = [102, 117, 110, 99, 116, 105, 111, 110, 32, 99, 104, 101, 99, 107, 40, 41, 123, 10, 10, 118, 97, 114, 32, 117, 115, 101, 114, 32, 61, 32, 100, 111, 99, 117, 109, 101, 110, 116, 91, 34, 103, 101, 116, 69, 108, 101, 109, 101, 110, 116, 66, 121, 73, 100, 34, 93, 40, 34, 117, 115, 101, 114, 34, 41, 91, 34, 118, 97, 108, 117, 101, 34, 93, 59, 10, 118, 97, 114, 32, 112, 97, 115, 115, 32, 61, 32, 100, 111, 99, 117, 109, 101, 110, 116, 91, 34, 103, 101, 116, 69, 108, 101, 109, 101, 110, 116, 66, 121, 73, 100, 34, 93, 40, 34, 112, 97, 115, 115, 34, 41, 91, 34, 118, 97, 108, 117, 101, 34, 93, 59, 10, 10, 105, 102, 40, 117, 115, 101, 114, 61, 61, 34, 67, 121, 98, 101, 114, 34, 32, 38, 38, 32, 112, 97, 115, 115, 61, 61, 32, 34, 84, 97, 108, 101, 110, 116, 34, 41, 123, 97, 108, 101, 114, 116, 40, 34, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 67, 111, 110, 103, 114, 97, 116, 122, 32, 92, 110, 32, 70, 108, 97, 103, 58, 32, 123, 74, 52, 86, 52, 95, 83, 99, 114, 49, 80, 116, 95, 49, 83, 95, 83, 48, 95, 68, 52, 77, 78, 95, 70, 85, 78, 125, 34, 41, 59, 125, 32, 10, 101, 108, 115, 101, 32, 123, 97, 108, 101, 114, 116, 40, 34, 119, 114, 111, 110, 103, 32, 80, 97, 115, 115, 119, 111, 114, 100, 34, 41, 59, 125, 10, 10, 125]
  >> res = "".join([chr(n) for n in dec])
  >> res
  'function check(){\n\nvar user = document["getElementById"]("user")["value"];\nvar pass = document["getElementById"]("pass")["value"];\n\nif(user=="Cyber" && pass== "Talent"){alert("                      Congratz \\n Flag: {J4V4_Scr1Pt_1S_S0_D4MN_FUN}");} \nelse {alert("wrong Password");}\n\n}'

Flag: {J4V4_Scr1Pt_1S_S0_D4MN_FUN}