Optical encryption by means of the Talbot array illuminator
John Fredy Barrera, Rodrigo Henao, Zbigniew Jaroszewicz, Andrzej Kołodziejczyk · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2005
The work presents the encryption process in the optical arrangement with the Talbot array illuminator (TAIL). The object to be encrypted is multiplicated, forming a periodical structure. Then the obtained periodical structure is placed in an optical set-up with a TAIL. The encryption is based on the Fresnel diffraction behind the TAIL. The encrypted image has a form resembling an elementary cell of the amplitude sampling filter. The decryption is based on the Talbot effect.