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Secure verification by multifactor optical validation Millán Garcia-Varela, M. Sagrario Pérez Cabré, Elisabet Javidi, Bahram Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria Universitat Politècnica de Catalunya. GOAPI - Grup d'Òptica Aplicada i Processament d'Imatge Àrees temàtiques de la UPC::Ciències de la visió::Òptica física Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia Cryptography Security systems Optical character recognition device industry Criptografia Sistemes de seguretat Reconeixement òptic de caràcters Postprint (published version) 2006 Conference report Millan, M., Pérez-Cabré, E., Javidi, B. Secure verification by multifactor optical validation. A: Optics and Photonics 2006, SPIE 51st Annual Meeting. "Optics and Photonics 2006: Optical Information Systems IV". San Diego: The International Society of Optical Engineering - SPIE, 2006, p. 63110N-1-63110N-11. 0-8194-6390-6 https://hdl.handle.net/2117/85387 10.1117/12.680614 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access application/pdf The International Society of Optical Engineering - SPIE María S. Millán, Elisabet Pérez-Cabré and Bahram Javidi, “Secure verification by multifactor optical validation” Optical Information Systems IV, Bahram Javidi, Demetri Psaltis, H. John Caulfield, Editors, Proc. SPIE 6311, 63110N (2006) Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.680614