We download file **SafeOpener.java** 
```import java.io.*;import java.util.*;  public class SafeOpener {    public static void main(String args[]) throws IOException {        BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));        Base64.Encoder encoder = Base64.getEncoder();        String encodedkey = "";        String key = "";        int i = 0;        boolean isOpen; 
        while (i < 3) {            System.out.print("Enter password for the safe: ");            key = keyboard.readLine();
            encodedkey = encoder.encodeToString(key.getBytes());            System.out.println(encodedkey);             isOpen = openSafe(encodedkey);            if (!isOpen) {                System.out.println("You have  " + (2 - i) + " attempt(s) left");                i++;                continue;            }            break;        }    }     public static boolean openSafe(String password) {        String encodedkey = "cGwzYXMzX2wzdF9tM18xbnQwX3RoM19zYWYz";         if (password.equals(encodedkey)) {            System.out.println("Sesame open");            return true;        }        else {            System.out.println("Password is incorrect\n");            return false;        }    }}```
We see in the file with Base64 encoding and we notice the variable encodekey "cGwzYXMzX2wzdF9tM18xbnQwX3RoM19zYWYz"
echo "cGwzYXMzX2wzdF9tM18xbnQwX3RoM19zYWYz" |base64 --d =>Flag: XXXXXX_XXX_XX_XXXX_XXX_XXXX