Krypton Level 3 → Level 4

cd /krypton/krypton3

ls -la

file *

The README file contains the challenge descriptions.

The provided hints:

cat HINT1

cat HINT2

We can decrypt this type of encryption using how many characters of English alphabet occurs in a string, for example the letter e is the most prevalent.

The other files could help us to find the key, to then use that key to decrypt the encrypted string in the krypton4:

cat krypton4

We can use tools like quipqiup, or dcodefr:

cat found1

cat found2

The third file contains the same type of string.

We can append the encrypted string to the end of this string:

And click solve:

The password for the next user is: BR***.