5 research outputs found
Optical encryption with noise-free recovery
Los sistemas de protecci贸n de informaci贸n basados en procesadores 贸pticos y que emplean una t茅cnica de codificaci贸n de doble m谩scara aleatoria de fase permiten el manejo seguro de los datos, pero su recuperaci贸n no est谩 libre de ruido. Si bien la seguridad del sistema es provista por el procesador 贸ptico que habilita encriptar la informaci贸n, en este trabajo se demuestra que la recuperaci贸n libre de ruido es posible mediante la inclusi贸n de la codificaci贸n de respuesta r谩pida, sin alterar el proceso de protecci贸n de datos. La informaci贸n que se desea proteger es previamente convertida en un c贸digo de respuesta r谩pida o c贸digo QR, y posteriormente el c贸digo es encriptado 贸pticamente. El c贸digo QR recuperado contendr谩 el ruido habitual producido por el uso de las m谩scaras aleatorias de fase y el procesamiento 贸ptico-digital involucrado en el proceso. Finalmente, al escanear el c贸digo QR desencriptado se puede recuperar la informaci贸n original completamente libre de ruido. Se incluye la descripci贸n te贸rica del procesador 贸ptico y se presentan resultados experimentales que demuestran la validez y aplicabilidad del sistema de protecci贸n.The information protection systems based on optical processors, employing a double random phase mask encryption technique, allow data securely handling, but the recovery is not noise-free. Although the system security is provided by the optical processor enabling the information encoding, we demonstrate in this contribution that noise-free recovery is indeed possible by including the quick response coding, without altering the data protection process. The information to be protected is first converted into a quick response code or QR code, and then this code is optically encrypted. The decrypted QR code exhibits the usual noise produced by the random phase masks along with the involved opto-digital processing. Finally, when scanning the decrypted QR code we recover the original information without noise. We include the theoretical description of the optical processor, as well as we show experimental results that corroborate the validity and applicability of the security system.Fil: Barrera Ramirez, John Fredy. Universidad de Antioquia; ColombiaFil: Torroba, Roberto Daniel. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico la Plata. Centro de Investigaciones Opticas (i); Argentina. Provincia de Buenos Aires. Gobernaci贸n. Comisi贸n de Investigaciones Cient铆ficas; Argentina. Universidad Nacional de La Plata. Facultad de Ingenieria; Argentin
XVI International Congress of Control Electronics and Telecommunications: "Techno-scientific considerations for a post-pandemic world intensive in knowledge, innovation and sustainable local development"
Este t铆tulo, sugestivo por los impactos durante la situaci贸n de la Covid 19 en el mundo, y que en Colombia lastimosamente han sido muy cr铆ticos, permiten asumir la obligada superaci贸n de tensiones sociales, pol铆ticas, y econ贸micas; pero sobre todo cient铆ficas y tecnol贸gicas.
Inicialmente, esto supone la existencia de una capacidad de la sociedad colombiana por recuperar su estado inicial despu茅s de que haya cesado la perturbaci贸n a la que fue sometida por la catastr贸fica pandemia, y superar ese anterior estado de cosas ya que se encontraban -y a煤n se encuentran- muchos problemas locales mal resueltos, medianamente resueltos, y muchos sin resolver: es decir, habr谩 que redise帽ar y fortalecer una probada resiliencia social existente - producto del prolongado conflicto social colombiano superado parcialmente por un proceso de paz exitoso - desde la tecnociencia local; como lo indicaba Markus Brunnermeier - economista alem谩n y catedr谩tico de econom铆a de la Universidad de Princeton- en su libro The Resilient Society鈥a cuesti贸n no es preveerlo todo sino poder reaccionar鈥prender a recuperarse r谩pido.This title, suggestive of the impacts during the Covid 19 situation in the world, and which have unfortunately been very critical in Colombia, allows us to assume the obligatory overcoming of social, political, and economic tensions; but above all scientific and technological.
Initially, this supposes the existence of a capacity of Colombian society to recover its initial state after the disturbance to which it was subjected by the catastrophic pandemic has ceased, and to overcome that previous state of affairs since it was found -and still is find - many local problems poorly resolved, moderately resolved, and many unresolved: that is, an existing social resilience test will have to be redesigned and strengthened - product of the prolonged Colombian social conflict partially overcome by a successful peace process - from local technoscience; As Markus Brunnermeier - German economist and professor of economics at Princeton University - indicates in his book The Resilient Society...The question is not to foresee everything but to be able to react...learn to recover quickly.Bogot
Data protection using a joint transform correlator experimental system
En esta contribuci贸n se presenta la implementaci贸n experimental un sistema de protecci贸n de informaci贸n basado en el procesamiento 贸ptico y se analiza la fidelidad de la informaci贸n recuperada cuando hay p茅rdida de datos durante la transmisi贸n. La informaci贸n es encriptada empleando una arquitectura 贸ptica de correlador de transformada conjunta y una t茅cnica de codificaci贸n de doble m谩scara de fase. Un usuario autorizado puede recuperar la informaci贸n original cuando tiene acceso a la informaci贸n del dato encriptado y de la llave de seguridad; si un intruso puede interceptar la imagen encriptada, pero no accede la informaci贸n de la llave de seguridad, no podr谩 acceder a la informaci贸n contenida en el dato encriptado. La descripci贸n te贸rica y los resultados experimentales demuestran la habilidad que tiene el sistema de seguridad para proteger y recuperar informaci贸n por medio de procesadores 贸pticos, y su tolerancia a la p茅rdida de informaci贸n durante la transmisi贸n.In this contribution the implementation of an experimental data protection system based on optical processing is presented, and the reliability of the recovered information when there is data loss during transmission is analyzed. The information is encrypted using an optical joint transform correlation architecture together with a double phase mask encoding technique. An authorized user recovers the original information when accessing the encoded data and the security key; if an intruder intersects the encoded image but does not possess the security key there is no possibility to access to the information contained in the encrypted image. The theoretical description and the experimental results show the ability the security systems exhibits to protect and recover the information by optical means, including the tolerance to data loss during transmission.Fil: Torroba, Roberto Daniel. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico la Plata. Centro de Investigaciones Opticas (i); Argentina. Provincia de Buenos Aires. Gobernaci贸n. Comisi贸n de Investigaciones Cient铆ficas; Argentina. Universidad Nacional de La Plata. Facultad de Ingenieria; ArgentinaFil: Barrera Ramirez, John Fredy. Universidad de Antioquia; Colombi
One-step reconstruction of assembled 3D holographic scenes
We present a new experimental approach for reconstructing in one step 3D scenes otherwise not feasible in a single snapshot from standard off-axis digital hologram architecture, due to a lack of illuminating resources or a limited setup size. Consequently, whenever a scene could not be wholly illuminated or the size of the scene surpasses the available setup disposition, this protocol can be implemented to solve these issues. We need neither to alter the original setup in every step nor to cover the whole scene by the illuminating source, thus saving resources. With this technique we multiplex the processed holograms of actual diffuse objects composing a scene using a two-beam off-axis holographic setup in a Fresnel approach. By registering individually the holograms of several objects and applying a spatial filtering technique, the filtered Fresnel holograms can then be added to produce a compound hologram. The simultaneous reconstruction of all objects is performed in one step using the same recovering procedure employed for single holograms. Using this technique, we were able to reconstruct, for the first time to our knowledge, a scene by multiplexing off-axis holograms of the 3D objects without cross talk. This technique is important for quantitative visualization of optically packaged multiple images and is useful for a wide range of applications. We present experimental results to support the method.Fil: Velez Zea, Alejandro. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico la Plata. Centro de Investigaciones Opticas (i); Argentina. Provincia de Buenos Aires. Gobernaci贸n. Comisi贸n de Investigaciones Cient铆ficas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Barrera Ramirez, John Fredy. Universidad de Antioquia; ColombiaFil: Torroba, Roberto Daniel. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico la Plata. Centro de Investigaciones Opticas (i); Argentina. Provincia de Buenos Aires. Gobernaci贸n. Comisi贸n de Investigaciones Cient铆ficas; Argentina. Universidad Nacional de La Plata. Facultad de Ingenieria; Argentin