Your iPhone or iPad are encrypted only as long as you use a password/PIN lock to protect your device — Touch ID and Face ID have the same purpose, but to enable either you have to set a password/PIN as well.
A hacker said recently that the passcode could be easily bypassed by using an unexpected trick. What sounded like a huge scare, however, turned out to be fake. Apple, however, assured users that there’s no easy way to brute force the iPhone, and the hacker’s work incorrect.