---
# System prepended metadata

title: NahamconCTF2024
tags: [Nahamcon CTF]

---

# IPromise
- Run the decryptIPromise() => got the flag in ecrypted.
# Taylor Swift
![image](https://hackmd.io/_uploads/SkMIJtgV0.png)
- We have key, enc, and xor encrypt => A ^ B = C => A = B ^ C
```
from base64 import b64decode as d
from pwn import xor
enc = "FRsIAQ8PVBUVEREIVERbBkURFkUIBxVQVkAYFxJfV0FYVkIVQgo="
key = "swifties!"

print(xor(d(enc), key.encode()))
```
# What's in the box
![image](https://hackmd.io/_uploads/SJULUjxV0.png)
- You recognize the script was generated using Makeself.
- Makeself is a self-extracting archive file, meaning that you have to create a folder to contain all extracted file from it.
![image](https://hackmd.io/_uploads/ry_d92gVC.png)
- Open file test:
![image](https://hackmd.io/_uploads/SyipBigEA.png)
- Open file python, you will see.
![image](https://hackmd.io/_uploads/ryAg8olVC.png)
- Overwrite in vsc, then get the flag.
![image](https://hackmd.io/_uploads/Byaqrix4C.png)
# A Locked Box
- We got a shell script for this challenge generated by Makeself again.
![image](https://hackmd.io/_uploads/ry9gz-RE0.png)
- We see the expected error, not correct hash, but we have the correct value of the hash so let’s change it.
- we see the 2 corrupted bytes, lets fix them with the correct hex values
`0x66 for “f” | 0x37 for “7”`
- I have changed it on visual code but got corrupted, so i fixed them on HxD.
![image](https://hackmd.io/_uploads/rkUof-REA.png)
- This is your flag:
![image](https://hackmd.io/_uploads/Bkb2fZ04A.png)


