Security is easiest when you are the password: You don’t have to memorize complicated keywords, but simply hold your face up to the camera or your finger on a sensor — and you can access your computer and online services. This biometric login is already standard on smartphones — either via a camera or a finger sensor built into the screen. This allows you not only to log in to your device, but also to make purchases in online shops or carry out banking transactions. However, many notebooks and PCs do not have a finger sensor or a camera with facial recognition. If your computer lacks the hardw…