Abstract: A method and system for secure communications includes obtaining at a first device and a chief device signals based on movement of at least one of the devices between them. Both the first device and chief device convert the signals into identical first secret keys which are then stored. The method and system next includes obtaining at a second device and a chief device signals based on movement between them of at least one of the devices. Both the second device and chief device convert the signals into identical second secret keys which are then stored. The chief device then encrypts first secret key with second secret key and transmits to the second device which decrypts it with its copy of second secret key obtaining first secret key. These communicating devices can then transmit data between them securely encrypted and decrypted with the first secret key.

Abstract: A selective radiation utilization apparatus includes an optical filtering device and a modulation device. The optical filtering device transmits one or more selected spectral bands of incoming solar radiation and reflects one or more remaining bands of the incoming solar radiation. The modulation device spatially modulates one of the one or more selected spectral bands or the one or more remaining bands and directs the spatially modulated one of the one or more selected spectral bands or the one or more remaining bands towards a target of illumination.

Abstract: Methods and systems for three-dimensional imaging include sampling one or more emissions which are reflected back from a target scene with one or more micro-channel plates. The one or more sampled emissions are processed in one or more frames. Within each frame a phase is extracted and a distance to the target scene and amplitude is determined on a pixel-by-pixel basis. A three dimensional image of the target scene is generated and provided based on the extracted phase and the determined distance and amplitude for the one or more frames.