on sample android application to access database Firebase (https://www.firebase.com/docs/android/quickstart.html), we just need to write
Firebase myFirebaseRef = new Firebase("https://<YOUR-FIREBASE-APP>.firebaseio.com/");
The problem is, if someone know my firebase url "https://.firebaseio.com/", they will be able to manipulate my data from their application. How to secure connect to Firebase? like a facebook or Google Api give us APP-Key or Secret. -Thank You