Abstract: Provided is a method for ensuring security of a system from unauthorized access, comprising the steps of receiving a force and a direction information over time corresponding to a physical movement of a mobile electronic device with a touch screen configured to, be held in a hand, the movement carried out by holding, and moving the mobile device with the hand; creating an analog signal corresponding to the force; digitizing the analog signal to form a set of binary bits; inputting the binary bits into a random number generator; using an output from the random number generator to form a password or a cryptographic key, wherein the password or the cryptographic key is used appropriately by the security system.