---
# System prepended metadata

title: No hack no CTF write up

---

# No hack no CTF write up 2024 chinese ver.
## crypto
### super easy decode
```
n=66874100049762646240147492397977579549553083399872470020691839934725993584071278591
e=5
c=2517681043059055235392399222720965384187503314138762257251209951353653150991756581
cipertext:4af517fc79bc8c6df3877c7e22e79f4b6cf2f98865fbf449eff33de0abfeda5e8500f26b28dde53be7d2a317a3234272
```
本題是先解密rsa
![image](https://hackmd.io/_uploads/H1_M-qaMJl.png)
然後你會得到AES key~~我應該先講好的~~然後把cipertext那去做AES decrypt解出來就會有一段base64```QVVBUHtwYnpjeTFya19wZWxjZzAwMH0=```然後那去做解碼會得到```AUAP{pbzcy1rk_pelcg000}```然後再做一段ROT13![image](https://hackmd.io/_uploads/B1Or-56MJg.png)

flag : ```NHNC{compl1ex_crypt000}```
## reverse
### easyyyyyyyyyy
![image](https://hackmd.io/_uploads/H1GWbYaGke.png)
flag : ```NHNC{this_is_a_easy_one}```
## misc
### M0unta1n
![m0unta1n](https://hackmd.io/_uploads/HJ4wZYpzyg.jpg)
Hint:
This may be in Kaohsiung Taiwan right?

![image](https://hackmd.io/_uploads/SkyAZFpMyx.png)
恩鳥松仁美
根據原圖片左邊有看到一座山頭，然後前面有一條馬路然後房子

![image](https://hackmd.io/_uploads/H1OlgcpM1l.png)
大概是這裡
題目說最近的路然後用英文並包在NHNC{}送出去
![image](https://hackmd.io/_uploads/r1JSgcTMke.png)
![image](https://hackmd.io/_uploads/ByrceqTG1e.png)
flag : ```NHNC{Songpu N. Ln.}```
## 心得
~~對不起我出題出的很爛~~