# Astatine {10 points}?
###### Challenge Description
Can you read the message?
5t4=2<(;4P0Q^YXDIYA21Ltn
###### Category : Steganography###### Author : Jerin John Mathew (Shadow_Walker)###### Team : Red Knights
![](https://img.shields.io/badge/10-Steganography-red) ![](https://img.shields.io/badge/-Cryptography-green)
So this is a Steganography challenge in which we have a **crypted text : 5t4=2<(;4P0Q^YXDIYA21Ltn**
The Challenge title gives us the name... _Astatine_
So.... time for a _chemistry class_ for CTF players... ?
_Astatine_ is basically one of the elements in the periodic table having an **atomic number 85**.It is the rarest naturally occurring element in the Earth's crust.
_End of Class_
This is the hint required "85" and you need to find the type of encryption methods with 85 in their name... OR a guy having good cryptographic knowledge can understand that it is **BASE 85 Encryption**
Now you just needed to take the string and submit to **Cyberchef** with base 85 recipie foe decrypting....and VOILA...
![](Base85CyberChef.png)
# FLAG OBTAINED :-->  AFFCTF{n0t_3nc0d3d} ... ?
For more information on base 85 :---> https://en.wikipedia.org/wiki/Ascii85
