Biometric security uses biometrics like fingerprints in lieu of passwords for top defense. Hacking becomes almost impossible. There isn't a normal protocol which allows all devices to talk to each other. Whilst Subject is purported to deal with this issue which is supported by just about every key service provider https://bestsmarthomedevices11048.shoutmyblog.com/33044001/the-ultimate-guide-to-smart-gadget