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Encryption in the physical layer based on spectral encoding implanted by DSP and applied to optical networks

Grant number: 18/12756-6
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): November 01, 2018
Effective date (End): May 31, 2020
Field of knowledge:Engineering - Electrical Engineering - Telecommunications
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Marcelo Luís Francisco Abbade
Grantee:Melissa de Oliveira Santos
Host Institution: Universidade Estadual Paulista (UNESP). Campus Experimental São João da Boa Vista. São João da Boa Vista , SP, Brazil


The objective of this project is to evaluate the application of a new technique of signal encryption to optical communication systems. The technique consists of using digital signal processing to: i) divide an input signal into several spectral slices, ii) apply a phase shift and delay own to each slice, and iii) spectrally multiplex all slices, iv) to generate an electronic output signal which is an encrypted (distorted) version of the input signal. The cryptographic key corresponds to the set of phases and delays used in this process. The encrypted electronic signal can then be modulated in an optical carrier and propagated by a transparent optical network. Agents that monitor some of the network unauthorizedly will not be able to recover the content of the signal due to the encryption used. At the authorized destination node, where the cryptographic key is known, the optical signal is converted to the electronic domain and processed digitally to decipher the signal. This is done by applying phase shifts and delays that are complementary to those used in encryption. To the best of our knowledge, this technique has never been addressed in the literature and, depending on its performance, has potential for commercial application. In this project, the technique will be implemented by codes written in Matlab and its performance will be evaluated through simulations in the software VPITransmissionMaker. A partnership with the CPqD Foundation will allow the realization of physical experiments to evaluate this technique. The proposal is part of our group's work with the Fotonicom 2 Program of the National Institutes of Science and Technology promoted by CNPq.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ABBADE, MARCELO L. F.; NOGUEIRA, MARCELO P.; SANTOS, MELISSA O.; FAGOTTO, ERIC A. M.; BONANI, LUIZ H.; ALDAYA, IVAN. DSP-Based Multi-Channel Spectral Shuffling Applied to Optical Networks. IEEE PHOTONICS TECHNOLOGY LETTERS, v. 32, n. 3, p. 154-157, . (18/12756-6, 19/02720-7, 18/21485-6)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SANTOS, Melissa de Oliveira. Encryption in the physical layer based on spectral encoding implanted by DSP and applied to optical networks.. 2020. Master's Dissertation - Universidade Estadual Paulista (Unesp). Câmpus Experimental de São João da Boa Vista.

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