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| Author(s): |
Melissa de Oliveira Santos
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São João da Boa Vista. 2020-06-30. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. São João da Boa Vista |
| Defense date: | 2020-05-29 |
| Advisor: | Marcelo Luís Francisco Abbade |
| Abstract | |
The objective of this project is to propose and evaluate the application of a new signal encryption technique for optical communications systems. The technique consists of using digital signal processing to: i) divide an input signal into several spectral slices, ii) apply a own phase shift to each slice, iii) to scramble these slices and iv) spectrally multiplex all slices, v) to generate a baseband output signal which is an encrypted (distorted) version of the input signal. This technique was called spectral phase encoding and scrambling cryptography by digital signal processing, DSP-SPE-Scr. The baseband encrypted signal is then modulated on an optical carrier and propagated by a transparent optical network. Results obtained suggest that the technique is safe against brute force attacks. Moreover, although the encrypted signal has a different power distribution that might excites the nonlinearities of the system, these signals can still be propagated by metropolitan networks with a diameter larger than 640 km, which indicates that the technique may be applied to commercial optical communication systems. Additionally, we found that working with the dynamic keys strategy in the DSP-SPE-Scr makes it even safer because, with this approach, Shannon's diffusion and confusion properties and semantic security are satisfied. To the best of our knowledge, this is the first time the dynamic keys are applied to signal encryption algorithm with the evaluation of diffusion and confusion properties and semantic security. (AU) | |
| FAPESP's process: | 18/12756-6 - Encryption in the physical layer based on spectral encoding implanted by DSP and applied to optical networks |
| Grantee: | Melissa de Oliveira Santos |
| Support Opportunities: | Scholarships in Brazil - Master |