1. Face recognition
Face recognition or facial recognition is nothing new. This method was first present on the Android version of Ice Cream Sandwich. This feature uses the device's front camera to take photos of your face and then use the photo as a baseline to unlock your device.
Unfortunately, the security of this feature has been questioned and more contra than the pros. Then, one of the biggest problems is that lighting must be ideal for the front camera so that it can take pictures of faces. There is a similar feature on the iPhone X, called Face ID, although the technology and the way it works is a little different.
2. Fingerprint Scanner
This feature is probably the most popular now, because many Android phones adopt it. How good the feature is, of course depends on several factors such as the quality of the sensor and its placement.
Quality, in this case, means the speed of the sensor reads your finger. This varies greatly between devices, and the surface is scratch-resistant. There are certain biometric authentication mechanisms that are faster when you use them.
Interestingly, reportedly this is the safest feature at the moment. This is because the fingerprint reader is quite difficult to hack. In addition, sensors are developed to recognize body heat and the user's blood movement.
3. Iris Scanner
This method basically does the same thing as a fingerprint reader, and it requires the device to have a second registered password if you can't unlock your cellphone.
In the Galaxy S9 and Note9, the fingerprint and iris scanner cannot be activated simultaneously. In other words, the method of opening the second key must be a PIN or alphanumeric password.
Quality also varies according to lighting conditions and where the user's eyes are positioned. Better readers will not slow down when they recognize the user's eyes, even in low light conditions.
Systems that scan your iris also need to be fully integrated into the reader so that they react quickly and cannot be hacked. Technically, this system is equivalent to a fingerprint reader in terms of security.
4. Smart Lock
Smart Lock was first introduced on Android 5.0 Lollipop, and has been updated in all the latest versions. This method is quite unique, because the user can open the device in various ways.
Choose your trusted location, such as your home or office, and when you arrive at those places, your device will be unlocked without having to use one of these methods. You can even use a Bluetooth device as a trusted location.
Currently, Smart Lock can also be set up so that it keeps your cellphone unlocked even in your pocket. Apparently this is not a method of unlocking your phone, but rather as a supplement. Remember that anyone can access your cellphone when you are in one of your trusted locations, or even connect to a Bluetooth device.
5. PIN
This method is quite simple, users only need to set numbers whose length depends on the Android version you have. PIN can be used as the main key method in a smartphone.
Unfortunately, the PIN is also limited in recovery if you forget. You may have to spend hours trying to unlock your device. In addition there are several smartphones that specify how many times you can try to open. If it doesn't match it can cause the device to delete user data.
Then, you can also use several locking options that are combined with a PIN.
6. Password
A password is the oldest unlock method available, and it is considered the safest by many users. You can use any number and letter combo to unlock your device. The recovery system is very varied but, in general, it is difficult to recover passwords like a PIN.
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