# [Prometheus](https://infernoctf.live/challenges#Prometheus)Crypto,200 Points
Author: alphachaos
Writeup by: **archerrival**
## Description>We've stumbled across what looks like a crashed Alien Spaceship. We're sending you a screenshot of the Remote Crashed Craft Computer Console to see if you can decipher anything from it.
![](images/prometheus1.png)
## Solution
The description mentions `Remote Crashed Craft Computer Console`, which corresponds to a rc4 encryption. This encryption requires a keyto use, so we turn back to the png file. The code at the top of the image looks similar to the [Masonic Cipher](https://sites.google.com/site/lostsymbolproject/masonic-cipher).
![](images/prometheus2.png)
Decrypting the code, we get `the key to decode is masonic`. Using `masonic` as our key to decrypt the binary in the image, we receive our flag.
```infernoCTF{5tr34ms_0f_Z3r0s_4nd_0n35}```