Cipher Cracking

Posted on Mon 20 March 2023 in ctf

This is a writeup of the Cipher CrackingTeaser challenge which was part of the Crypto category during vikeCTF.

95c86d4851dba07315a1eaf8e34cfa21.png

The flag could easily extracted from the attached file with the use of CyberChef. For this the following config can be used:

From_Morse_Code('Space','Line feed')
Find_/_Replace({'option':'Regex','string':'F'},'0',true,false,true,false)
Find_/_Replace({'option':'Regex','string':'T'},'1',true,false,true,false)
From_Binary('Space',8)
From_Base64('A-Za-z0-9+/=',true,false)
Find_/_Replace({'option':'Simple string','string':'.'},':',true,false,true,false)
From_Decimal('Colon',false)
From_Base32('A-Z2-7=',true)
Reverse('Character')
ROT13(true,true,false,19)

This results in the flag: vikeCTF{C0D3_8r34K3r5_637_Cr4CK1N6}

ctf crypto