Review

The key used is defined statically in the code.

Generate a non-predictable key.

• missing/condition/value_or_state

Encrypting.java

encryptWithKey(byte[])

code not found

public class NonStaticKey {
	public static byte[] decrypt(byte[] key, byte[] content) throws Exception {
		SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
		Cipher c = Cipher.getInstance("AES/CBC/NoPadding");
		c.init(Cipher.DECRYPT_MODE, keySpec);
		return c.doFinal(content);
	}
}