# crypto/xorpals
Author: m0x
## Description
```One of the 60-character strings in the provided file has been encrypted by single-character XOR. The challenge is to find it, as that is the flag.
Hint: Always operate on raw bytes, never on encoded strings. Flag must be submitted as UTF8 string.```
Downloads: `flags.txt`
## Solution
There are 98 lines in flags.txt, and one of them is a flag that was xor'd with a single character. So this is just a brute-force exercise. For each line, xor it with a value between 0 and 255, until you find a string starting with `dam`:
```python3#!/usr/bin/env python3
f = open(f"flags.txt", 'r')lines = f.readlines()for line in lines:    b = bytes.fromhex(line)    for k in range(255):        d = bytes([b[i] ^ k for i in range(len(b))])        if d[:3] == b'dam':            print(d)            break```
```$ ./solve.pyb'dam{antman_EXPANDS_inside_tHaNoS_never_sinGLE_cHaR_xOr_yeet}'```
The flag is:
```dam{antman_EXPANDS_inside_tHaNoS_never_sinGLE_cHaR_xOr_yeet}```