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.

  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