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FPGA-based Chaotic Cryptosystem by Using Voice Recognition as Access Key

2018; Multidisciplinary Digital Publishing Institute; Volume: 7; Issue: 12 Linguagem: Inglês

10.3390/electronics7120414

2079-9292

Eduardo Rodríguez-Orozco, Enrique Efrén García-Guerrero, Everardo Inzunza-González, Oscar Roberto López-Bonilla, Abraham Flores-Vergara, José Ricardo Cárdenas-Valdez, Esteban Tlelo‐Cuautle,

Cellular Automata and Applications

A new embedded chaotic cryptosystem is introduced herein with the aim to encrypt digital images and performing speech recognition as an external access key. The proposed cryptosystem consists of three technologies: (i) a Spartan 3E-1600 FPGA from Xilinx; (ii) a 64-bit Raspberry Pi 3 single board computer; and (iii) a voice recognition chip manufactured by Sunplus. The cryptosystem operates with four embedded algorithms: (1) a graphical user interface developed in Python language for the Raspberry Pi platform, which allows friendly management of the system; (2) an internal control entity that entails the start-up of the embedded system based on the identification of the key access, the pixels-entry of the image to the FPGA to be encrypted or unraveled from the Raspberry Pi, and the self-execution of the encryption/decryption of the information; (3) a chaotic pseudo-random binary generator whose decimal numerical values are converted to an 8-bit binary scale under the VHDL description of m o d ( 255 ) ; and (4) two UART communication algorithms by using the RS-232 protocol, all of them described in VHDL for the FPGA implementation. We provide a security analysis to demonstrate that the proposed cryptosystem is highly secure and robust against known attacks.