## Difficulty
50/100 | MEDIUM

They need to figure out that the first part of the message is a 
substitution alphabet, then decrypt the code, and then finally
figure out the flag is embedded in the last message they sent.

## Category
Crypto

## How To Solve

The first part of every message line was a substitution table,
the second part the message. Just substitute the message and the
last message will contain the flag.

```python3
from pwn import *
import string

p = remote("localhost", 3006)
p.recvline()


while True:
    msg = p.recvline().decode()
    p.recvuntil(b"> ")
    print(msg)

    alphabet = msg.split(" | ")[0]
    message = msg.split(" | ")[1][:-1]
    alphabet_map = dict(zip(alphabet, string.ascii_letters))

    decoded = "".join([alphabet_map[c] if c in alphabet_map else c for c in message])
    print(f"Sending back decoded: '{decoded}'")
    p.sendline(decoded.encode())

    p.recvline()

```

## Flag
IGCTF{Some-wicked-story-unfolded-here-great-work}