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Adaptation of spectral encryption to the Advanced Encryption Standard paradigm

Grant number: 19/14858-3
Support type:Scholarships in Brazil - Master
Effective date (Start): March 01, 2020
Effective date (End): January 31, 2021
Field of knowledge:Engineering - Electrical Engineering
Principal Investigator:Marcelo Luís Francisco Abbade
Grantee:Welerson Santos Souza
Home Institution: Universidade Estadual Paulista (UNESP). Campus Experimental São João da Boa Vista. São João da Boa Vista , SP, Brazil

Abstract

Data encryption processes bits to provide confidentiality in the higher layers of the Open System for Interconnections (OSI) reference model. Among the most commonly used commercial strategies for data encryption is the Advanced Encryption Standard (AES), a secure standard that meets the diffusion and confusion properties established by Shannon. These properties must be met in secure encryption techniques. On the other hand, the signal encryption is a promising topic of research that may be complementary to the data encryption. This type of encryption acts on the signals that will be transmitted by the physical layer of the OSI model. The goal of this project is to develop and evaluate a new encryption technique in the physical layer. This technique divides the input signal into spectral slices and performs operations analogous to AES with Digital Signal Processing (DSP). The spectral slices are analogous to the AES encrypted bytes and will undergo repetitive spectral phase and delay encoding (SPDE) operations, substitution and permutation to provide confusion and diffusion characteristics to the encrypted signal. The cryptographic keys of the technique are the sets of phases and delays used in each round of encryption. The performance of the new technique, SPDE-SPN (SPDE with substitution and permutation network), will be evaluated by computational simulations. For these evaluations, the propagation of encrypted signals by (i) a channel with additive white Gaussian noise (AWGN) and non-linearities and (ii) by optical networks will be simulated. The technique is expected to provide similar or superior security results to AES, with the benefits of cryptography at the physical layer. (AU)