# TJCTF – Tinder
* **Category:** binary* **Points:** 25
## Challenge
> Start swiping!> Attachments:> > binary> > nc p1.tjctf.org 8002
## Solution
if we dissassemble the binary we see a cmp instruction that leads to the flag :
![screenshot](https://github.com/0d12245589/CTF-writeups/raw/master/2020/TJCTF/binary/tinder/images/screenshot2.png)![screenshot](https://github.com/0d12245589/CTF-writeups/raw/master/2020/TJCTF/binary/tinder/images/screenshot1.png)
btw `var_C = 0`
and we see that it reads before the bio at `ebp-0x80` and then compares the integer at `ebp` with `0x0C0D3D00D`
so by playing around to find the exact offset which is `0x74`
I wrote a [script](https://github.com/0d12245589/CTF-writeups/raw/master/2020/TJCTF/binary/tinder/solve.py) using pwntools to get a match (I mean the flag)
```tjctf{0v3rfl0w_0f_m4tch35}```