The Indecipherable Cipher

Challenge Description:

Some say this cipher cannot be deciphered. Well, do you believe them?

Even worse, some say this cipher is misattributed!

I would say that the key to solving this challenge is to remember who the true inventor was.

Files Attached:

cipher.txt

Solution:

Tools used:

Having a look at the cipher text, we can see that the general structure of the flag was still there, but it has obviously been jumbled. Since the challenge description mentioned that the key to solving this challenge is to remember was the true inventor was, I guessed that the cipher used was a vigenere cipher.

A quick look at the Wikipedia page (which is the source of Truth™) tells us that this cipher was invented by one “Giovan Battista Bellaso”

So I tried their full name! But it didn’t work… not completely

So, I tried just using their first name, “Giovan”, which resulted in success!

Flag:

WH2022{v1g3n3r3_15_Juz_Ca3s@r_C1pH3R_0N_sT3R01Ds}