Resumo

RUEDA-PARADA, JORGE ENRIQUE  e  ROMERO-BECERRA, ANA LUDIA. OPTICAL CRYPTOGRAPHY USING FRESNEL DIFFRACTION AND PHASE CONJUGATION. Dyna rev.fac.nac.minas [online]. 2013, vol.80, n.181, pp.25-30. ISSN 0012-7353.

Optical processor was implemented to encrypt images using Fresnel diffraction in free space. We use four-wave mixing to record encrypted image into a photorefractive crystal BSO and decode it by phase conjugation. In each image encrypted only use a key. We characterize the processor in terms of the phase values of the key, and determine the lower limit of the average value of the phase in which we obtained a full encryption. The processor operates in real time.

Palavras-chave : Cryptography; Wave Mixing; Photorefractive; Holography; Diffraction.

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