# Solution
```python
import string

charset = string.printable
eq = lambda a, b : (a << ((8 - b) & 0x1f)) | (a >> (b & 0x1f))
random_values = [
0x22, 0x0d, 0x1e, 0x0c, 0x12, 0x0b, 0x0a, 0x27, 0x18, 0x10, 0x02,
0x00, 0x14, 0x1c, 0x0e, 0x01, 0x06, 0x13, 0x09, 0x08, 0x20, 0x1d,
0x16, 0x29, 0x11, 0x25, 0x04, 0x23, 0x05, 0x24, 0x26, 0x1a, 0x28,
0x07, 0x1f, 0x19, 0x03, 0x21, 0x0f, 0x15, 0x1b, 0x17
]

with open('./flag.enc', 'rb') as f:
enc = f.read()

for i in range(len(enc) - 4):
for c in charset:
if eq(ord(c) ^ random_values[i], 5) & 0xff == enc[i]:
print(c, end='')

print()
```

# Explanation
https://youtu.be/cc-FYlChsS8