Art Work

50 points

Solution

The attached file looks like a utf-16 encoded mess. But, in fact it isn’t. The script below is self-explaining.
Workflow is as below:

1. drop all the non-printable characters
2. base58 decode the payload
3. base64 decode the payload
4. replace all ‘I’ and ‘l’ with ‘0’ and ‘1’
5. read the payload as binary written string
6. get the flag 😉

Flag

SBCTF{73h_4r7_0f_D3c1Ph3r1Ng}

 

Thanks to:

https://szymanski.ninja/en/ctfwriteups/2021/securebug-odin/artwork/