A switch-scanning circuit includes a chip and switching units. The chip includes pins having an output operation mode and an input operation mode, and a processing unit. The processing unit sets one of the pins as an input pin and the rest of the pins as output pins sequentially according to a clock signal, uses a scan signal to provide different voltages to the output pins, and then determines states of button switches according to a voltage of the input pin. The switching unit includes a power source resistance, switches and resistors. A first terminal and a second terminal of the power source resistance are electrically connected to a power source and a first pin respectively. The resistors have terminals electrically connected the first pin and terminals of the switches. The other terminals of the switches are connected to the pins other than the first pin.

A switch-scanning circuit includes a chip and switching units. The chip includes pins having an output operation mode and an input operation mode, and a processing unit. The processing unit sets one of the pins as an input pin and the rest of the pins as output pins sequentially according to a clock signal, uses a scan signal to provide different voltages to the output pins, and then determines states of button switches according to a voltage of the input pin. The switching unit includes a power source resistance, switches and resistors. A first terminal and a second terminal of the power source resistance are electrically connected to a power source and a first pin respectively. The resistors have terminals electrically connected the first pin and terminals of the switches. The other terminals of the switches are connected to the pins other than the first pin.

A scan method for keyboards is firstly to set a higher voltage or a lower voltage to a keyboard scan input/output port when a low voltage signal is generated at a keyboard scan input port, and then to detect a voltage at the keyboard scan input/output port or the keyboard scan input port so as to determine whether the detected low voltage signal is a valid button-depressed signal or a noise. Further, a grounding resistor is connected electrically to the keyboard scan input/output port, and the scan method prevails as well to determine whether or not a detected low voltage signal is a valid button-depressed signal.

A scan method for keyboards is firstly to set a higher voltage or a lower voltage to a keyboard scan input/output port when a low voltage signal is generated at a keyboard scan input port, and then to detect a voltage at the keyboard scan input/output port or the keyboard scan input port so as to determine whether the detected low voltage signal is a valid button-depressed signal or a noise. Further, a grounding resistor is connected electrically to the keyboard scan input/output port, and the scan method prevails as well to determine whether or not a detected low voltage signal is a valid button-depressed signal.

Provided is a process that includes: obtaining a multi-byte character set specifying a plurality of characters; receiving a knowledge factor credential encoded with a plurality of characters of the multi-byte character set, wherein the knowledge factor credential has a longer effective length than an apparent length, and wherein the knowledge factor credential has at least one character outside of a block of characters designated for a locale of the computing device; and providing the knowledge factor credential to authenticate a user.

Provided is a process that includes: obtaining a multi-byte character set specifying a plurality of characters; receiving a knowledge factor credential encoded with a plurality of characters of the multi-byte character set, wherein the knowledge factor credential has a longer effective length than an apparent length, and wherein the knowledge factor credential has at least one character outside of a block of characters designated for a locale of the computing device; and providing the knowledge factor credential to authenticate a user.

An input device provides control information to a host device and including a plurality of keys, a division module and a control module is disclosed. When an object presses a specific key, the specific key generates a resistance value according to a force applied by the object. The division module receives the resistance value and generates a voltage level according to the resistance value and a first level. The control module generates the control information according to the voltage level. The host device executes a function corresponding to the specific key according to the control information.

A keyboard scanning circuit includes a plurality of switching elements, M scanning lines and N sensing lines. Each of the sensing lines has a common node extended to M transmission lines. A switching element is coupled where one of the transmission lines and one of the scanning lines intersects. Two scanning lines correspondingly coupled through two switching elements to two transmission lines extended from one sensing line are different from each other.

A keyboard scanning circuit includes a plurality of switching elements, M scanning lines and N sensing lines. Each of the sensing lines has a common node extended to M transmission lines. A switching element is coupled where one of the transmission lines and one of the scanning lines intersects. Two scanning lines correspondingly coupled through two switching elements to two transmission lines extended from one sensing line are different from each other.