An unusual and interesting way of biometric user authentication was discovered by a group of German researchers from the University of Stuttgart, Saar University and the Max Planck Institute for Informatics. The device, called SkullConduct (\ Studies have shown that each person’s skull reacts to sound in its own way, which allows you to identify the user. SkullConduct is equipped with a bone conduction speaker on one side and a microphone on the opposite side of the headset. The sound played, invisible to human hearing, passing through the cranial bone, is transformed, and a sensitive microphone picks up the altered sound. The device verifies the result with an early recording. During laboratory experiments, the prototype of the device identified users with 97% accuracy. It is not yet known whether this technology will come out of the walls of the laboratory for widespread use. However, it is worth noting that such a device would make life easier for users, because it would no longer be necessary to store dozens of passwords in your head for gadgets, websites, electronic mailboxes and so on.