Krypton Level 1 → Level 2

As mentioned in the previous challenge description, all files for challenges will be stored under /krypton/ directory.

cd /krypton/krypton1

ls

cat README

cat krypton2

So for the next user's password, it is encoded with rot13 also known as Caesar cipher.

We can decrypt it with python:

Encoded_String = "YRIRY GJB CNFFJBEQ EBGGRA"  
Decoded_String = ""  
  
for char in Encoded_String:  
    if char.isupper():  
        Decoded_String += chr((ord(char) - ord('A') + 13) % 26 + ord('A'))  
    else:  
        Decoded_String += char  
  
print(Decoded_String)

vim script.py

:wq

cat script.py

python3 script.py

Or using cyberchef:

We can brute force the amount of rotations:

Encoded_String = "YRIRY GJB CNFFJBEQ EBGGRA"  
  
for rotate in range(26):  
    Decoded_String = ""  
    for char in Encoded_String:  
        if char.isupper():  
            Decoded_String += chr((ord(char) - ord('A') + rotate) % 26 + ord('A'))  
        else:  
            Decoded_String += char  
    print(Decoded_String)

vim script.py

:wq

cat script.py

python3 script.py

That is the password for the next user: ROT***.