Abstract: A sighting system for use with firearms, including an LED light, a power source for powering the LED light, a circuit that receives current from the power source and provides current to the LED light, wherein the current provided to the LED light is lower than 1% of a minimum forward current listed for the LED light by the LED light manufacturer and responsive to the current the LED light provides light that is visible at least in a dark environment, a housing for encasing the LED light, power source and circuit to act as an independent unit; wherein the housing is designed to be retrofit entirely on top of the firearm, so that in dim light a user is guided by light from the LED light to align the firearm toward a target.

Abstract: A sighting system for use with firearms, including an LED light, a power source for powering the LED light, a circuit that receives current from the power source and provides current to the LED light, wherein the current provided to the LED light is lower than 1% of a minimum forward current listed for the LED light by the LED light manufacturer and responsive to the current the LED light provides light that is visible at least in a dark environment, a housing for encasing the LED light, power source and circuit to act as an independent unit; wherein the housing is designed to be retrofit entirely on top of the firearm, so that in dim light a user is guided by light from the LED light to align the firearm toward a target.

Abstract: A sighting system for use with firearms having a barrel for releasing a projectile toward a target, including an LED light, a power source for powering the LED light, a circuit that receives power from the power source and provides it to the LED light and controls the LED light, a housing for encasing the LED light, power source and circuit to act as an independent unit, wherein the housing is designed to be retrofit entirely on top of the barrel of the firearm, so that in dim light a user is guided by light from the LED light to align the barrel toward the target.

Abstract: A sighting system for use with firearms having a barrel for releasing a projectile toward a target, including an LED light, a power source for powering the LED light, a circuit that receives power from the power source and provides it to the LED light and controls the LED light, a housing for encasing the LED light, power source and circuit to act as an independent unit, wherein the housing is designed to be retrofit entirely on top of the barrel of the firearm, so that in dim light a user is guided by light from the LED light to align the barrel toward the target.

Abstract: An anti-tampering protection assembly for sensing tampering with at least one conductor, the anti-tampering protection assembly including unpredictably varying signal generating circuitry, connected to the at least one conductor, for providing unpredictably varying signals on the at least conductor and tampering sensing circuitry for sensing tampering with the at least one conductor.

Abstract: An anti-tampering protection assembly for sensing tampering with at least one conductor, the anti-tampering protection assembly including unpredictably varying signal generating circuitry, connected to the at least one conductor, for providing unpredictably varying signals on the at least conductor and tampering sensing circuitry for sensing tampering with the at least one conductor.

Abstract: An anti-tampering protection assembly for sensing tampering with at least one conductor, the anti-tampering protection assembly including unpredictably varying signal generating circuitry, connected to the at least one conductor, for providing unpredictably varying signals on the at least conductor and tampering sensing circuitry for sensing tampering with the at least one conductor.

Abstract: A secure data entry device including a housing, tamper sensitive circuitry located within the housing and tampering alarm indication circuitry arranged to provide an alarm indication in response to attempted access to the tamper sensitive circuitry, the tampering alarm indication circuitry including at least one conductor, a signal generator operative to transmit a signal along the at least one conductor and a signal analyzer operative to receive the signal transmitted along the at least one conductor and to sense tampering with the at least one conductor, the signal analyzer being operative to sense the tampering by sensing changes in at least one of a rise time and a fall time of the signal.

Abstract: A secure data entry device including a housing, tamper sensitive circuitry located within the housing and tampering alarm indication circuitry arranged to provide an alarm indication in response to attempted access to the tamper sensitive circuitry, the tampering alarm indication circuitry including at least one conductor, a signal generator operative to transmit a signal along the at least one conductor and a signal analyzer operative to receive the signal transmitted along the at least one conductor and to sense tampering with the at least one conductor, the signal analyzer being operative to sense the tampering by sensing changes in at least one of a rise time and a fall time of the signal.

Abstract: An anti-tampering protection assembly for sensing tampering with at least one conductor, the anti-tampering protection assembly including unpredictably varying signal generating circuitry, connected to the at least one conductor, for providing unpredictably varying signals on the at least conductor and tampering sensing circuitry for sensing tampering with the at least one conductor.

Abstract: A secure data entry device including a housing, tamper sensitive circuitry located within the housing and tampering alarm indication circuitry arranged to provide an alarm indication in response to attempted access to the tamper sensitive circuitry, the tampering alarm indication circuitry including at least one conductor, a signal generator operative to transmit a signal along the at least one conductor and a signal analyzer operative to receive the signal transmitted along the at least one conductor and to sense tampering with the at least one conductor, the signal analyzer being operative to sense the tampering by sensing changes in at least one of a rise time and a fall time of the signal.