# Simple Checkin
A binary file was given, I used ghidra to view the source code of it.


In main function I observed that there were two long array are assigned to some values. And when I scroll down an `XOR` operation was done between these two array elements.

```C
for (local_78 = 0; local_78 < local_7c; local_78 = local_78 + 1) {
if ((local_68[local_78] ^ (int)(char)local_48[local_78]) != local_58[local_78]) {
local_74 = 0;
}
}
```

So, I copied the values of those two arrays performed a simple XOR between them, it resulted the flag.

# [Original Writeup](https://themj0ln1r.github.io/posts/cryptoversectf23)