Kinetic entropy

Making strong passwords is really important. When big databases eventually leak, what separates the hacker and you, is how long and difficult to guess your password is. Some passwords are so strong that they are impossible to crack. Basically, it boils down to how random your passwords is, finding true randomness is difficult, but a good source for randomness, is your body movement. Passguard combines kinetic body-movement, with a static sound, radio-waves and light measurements to create truly random passwords.

More about kinetic entropy: Wikipedia