Rating: 2.0
# I need bass {100 points} ?
##### Category : Steganography
##### Author : Jerin John Mathew (Shadow_Walker)
##### Team : Red Knights
 
I need a bass to earn some bitcoin! http://web5.affinityctf.com/
This is quite a simple challenge as compared to the other Stego challenges ?
Only needed a good cryptography knowledge...
First go to the above link and you will see something like this....
Now upon observation we can see an encoded string... jcvS2fvr1nVNnxHDs6WECRem3piWBdxQsHuQ6vmcJRfArv8ogsXzU
bass can be related to base encoding... {_Bitcoins are encrypted_}
So we took the string and fed it to cyberchef console, which detected the type of encryption of the following string...
The String was of **Base58 encoding**...
cipher text : jcvS2fvr1nVNnxHDs6WECRem3piWBdxQsHuQ6vmcJRfArv8ogsXzU
decrypted text : AFFCTF{ThisBaseEncodingIsUsedInBitCoin}
## Flag Obtained :- AFFCTF{ThisBaseEncodingIsUsedInBitCoin} ... ?
Another method :-
You can also write a small script for the same...
```python
import base58
cipher = "jcvS2fvr1nVNnxHDs6WECRem3piWBdxQsHuQ6vmcJRfArv8ogsXzU"
s = base58.b58decode(cipher)
f = open('flag', 'w')
f.write(str((s)))
f.close()
```
Check out this article for more information on the topic of _Bitcoins & Base58_ :--> https://en.bitcoin.it/wiki/Base58Check_encoding
