En nuestra última edición

Low-cost meteorological platform based on zigbee technology

Computer- assisted analysis for e-portfolio learning strategy

Smart home control by voice using neural networks

Application software as global marketing strategy

Methodology used in the design and construction of a computer numerical control machine

Exergy analysis for a furnace in the production of panela

Reflection on the requirements specification in a university context

Digital social networks: an approach to risk management information systems

Analysis of the current system of a clay block dryer and an improvement proposal

Algorithms and systems based on patterns of stem cell and artificial cloning for automation and control in an assembly operation in metalworking processes

Development of a software to apply zoometria in bovine cattle

Design and simulation of a prototype of machine for signaling of ways, automated through a mechanical system

Modelation of modal election for urban public transport based on the introduction of a new mode

Evaluation of resistance to flexion in glazed ceramic tile in terms of ice and thaw cycles

A look at the onto- epistemic fundamentals of the career of system engineering as a basis for rethinking the social impact in times of changing

Structural analysis of a pressing machine for production of solid brick for small craft industries of ceramic materials in Ocaña, Norte de Santander, and in the region

Identification of vegetable coverages from satellite images over the middle and lower basin of the Catatumbo river

Aplication of lattice boltzmann equation method to the bidimensional simulation of typical fluids mechanic problem

The historical references of professional. development case study of teachers teaching in the basic primary education in Colombia

Critical thinking of students using facebook like new technology learning

Resumen

 

 

OPTICAL CRYPTOSYSTEM: AN IMPLEMENTATION USING PHOTOREFRACTIVE HOLOGRAPHY AND LCR2500 MODULATOR

CRIPTOSISTEMA ÓPTICO: UNA IMPLEMENTACIÓN UTILIZANDO HOLOGRAFÍA FOTORREFRACTIVA Y UN MODULADOR LCR2500
PhD. Jorge Enrique Rueda
Fís. Ana Ludia Romero
Universidad de Pamplona. Grupo Óptica Moderna, Departamento de Física
Ciudadela Universitaria. Pamplona, Norte de Santander, Colombia.

Abstract: This paper presents the results of the implementation of optical encryptiondecryption
processor in real-time, using diffraction in free propagation as mechanism of
correlation and convolution operations, and the use of a liquid crystal modulator
(LCR2500) and a photorefractive crystal (Bi12SiO20). We used the advantages of fourwave
mixing in the photerefractive crystal, firstly to store encrypted data holographically,
and also phase conjugation was used to decrypt the information in parallel to the
encryption process.

Keywords: Cryptography, Holography, Wave Mixing, Photorefractive Crystals, Twisted
Nematic Crystals.

Resumen: En este trabajo se presentan los resultados de la implementación de un
procesador de encriptación-descencriptación óptica en tiempo real, utilizando difracción
en propagación libre como mecanismo de operaciones de correlación y convolución, y el
uso de un modulador de cristal líquido (LCR2500) y un cristal fotorrefractivo (Bi12SiO20).
Utilizamos las ventajas de la mezcla de cuatro ondas en el cristal fotorrefractivo, por un
lado, para almacenar holográficamente la información encriptada, y de otra parte se
aprovecha la conjugación de fase para descencriptar la información en paralelo al proceso
de encriptación.

Palabras clave: Criptografía, Holografía, Mezcla de Ondas, Cristales Fotorrefractivos,
Cristales Twisted Nematic.