Have a challenge about "bad encryption practices" where we hardocde the key and the secret in java.

Steps to take:

• create a secret on your computer
• encrypt it with your algorithm of choice (could be AES, 3DES, whatever you like) on your computer resulting in the ciphertext you need
• now take the ciphertext and put that in the java code of the challenge
• add the key you used to encrypt the challenge and a decryption method to the challenge. See contributing.md on how to create the challenge.