Easy way to change root, no hacking? Through Rock app

I launched rock app.

It said something like "Your default root password is alpine. It is unsafe...blah blah"

And now a screen:

SSH Passwords

Please enter your new password for user(s) root & mobile

---

Is this trustworthy? It was from launching the rock app.

Edit: I changed the pass since it obviously knew my current root...so it couldn't hurt to try. It said "Thank you! Your iPhone is now secure!"