A Framework of Optical Sensing and Actuation With Secure-Access Card Using Spatial-Geometry Codes

Information security deals with provisioning of secrecy to data, often based on digital techniques such as encryption and data hiding. There has been significant growth in applications of smart sensors for high speed secure access and automation of indoor electro-mechanical systems. This paper develops a preliminary study of secure sensing using optical key or card that is illuminated by panel of IR LED with some location distribution. The card provides secure access by random combinations of geometrical features mapped using binary codes in the X-Y finite field. The physical features represent various levels of secure code and are not easily detectible between a back-to-back case or seal. The card acts like a physical encryption channel that transforms optical data from IR source for performing various predefined actions. A one-time password feature communicated to user's mobile phone notifies of possible breach if spoofed card is used or if breaking in using the card. The analytic framework is given by architecture comprising of: 1) optical section: encryption of optical signals by card representing Generator matrix of X-Y product code and 2) electronics section: sensing voltage levels and processing of the data for control and actuation. This paper also introduces capabilities of the sensing architecture against some error patterns and likely attacks.