Disobey 2023 - CTF - The One-time Pad
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Assignment here was:

The method in the "New and Improved Rot13" is an example of a polyalphabetic substitution cipher, an 
encryption method known already in the 15th century. If you encode each number in the substitution 
length pattern (called "key") by a letter (A=rot-0, Z=rot-25), you get a cipher called Vigenere.
The upside of the Vigenere cipher is that if you choose a long enough key, the cipher actually 
becomes theoretically unbreakable. However, in the key selection process, randomness is key: if you 
use an easily guessable key, your cipher will get easily broken. Like this one:

LNQHBUNFDQ

After looking at this for a while it became obvious, as said in the assignment, randomness is the key.

So again turned to dcode.fr.

When using the above mentioned cipher and key, the result is: UNDENIABLY.

Maybe a bit too easy this one :)