In the encrypt.py file, the encrypt method was found to be xored with 0x66.

```python
enc = open("flag.enc.txt","r").read()
for i in enc:
⠀ i = chr(ord(i)^0x66)
⠀ print(i,end='')
```

In the encrypt.py file, the encryption method was found to be xored with 0x66. I programmed a python code to double it
FLAG : ```KCTF{ju5t_4_b45ic_x0r}```