[WRITEUP] Cyber Jawara 2016 Offline - stupidxor

by kod0kk - 10-31-2016 at 07:58 AM
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#1
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Posted: 10-31-2016, 07:58 AM
hello guys, oke kali ini ijinin ane bahas soal offline cyber jawara 2016 yang stupidxor ..
  • jadi di soal ini kita dikasih 2 file, yaitu sebuah xor cipher dan sebuah source code python yang digunakan untuk encrypt/decrypt xor nya

    [Image: PUbyRPD.png]


  • file xor cipher

    [Image: 8cygD2n.png]


  • script stupidxor.py

    [Image: rj2DDRt.png]


  • sesuai dengan nama soalnya stupidxor, maka coba gunakan script python tersebut untuk decode encrypted text, dengan kunci yang sama pula :D berikut script solve nya

    [Image: EwF0EHk.png]

  • jalankan, dan bingo !! dapat flagnya :D

    [Image: 0jHbrv2.png]

thanks, sekian pembahasan kali ini maaf kalo ada salah salah kata yaa ..
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#2
Posted: 11-06-2016, 10:12 PM
bang kalau punya soal2 CJ 2016 share dong :D
terutama soal yang final
root@localhost:~# cat something.txt
Dompu Linuxer
I'm Nothing Without Allah
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