Evaluación de eficiencia energética en las comunicaciones encriptadas de una red de sensores inalámbricos (WSN) que monitoriza ondas sísmicas.

Abstract

The following investigation's objective was to evaluate the energy efficiency in the encrypted communications of a wireless sensor network that monitors systemic waves. A model with five areas that simulate the telluric movement was built, each area consists of a motor with a centrina attached to a wooden plate, each motor has its respective pulse width modulator circuit (PWM) that allows to vary the movement of these plates, each board has a sensor node composed of a piezoelectric sheet that monitors the movements, a waspmote card that processes the sensor signals and encrypts them, a zigbee that sends the encoded information to a gateway node, it receives all the information from the five sensor nodes, and a battery that feeds each node. For the services offered by the cards, two types of encryption were selected, symmetric and asymmetric; being the algorithms AES128, AES192 and AES 256 corresponding to symmetric encryption and RSA to asymmetric encryption. For this evaluation, 35 bytes of data were transmitted in plain text, being transformed to 61 bytes with the AES algorithm in its three key length types and in 96 bytes with RSA. Three measuring tools were used: a Series 830 multimeter and a RadioShack multimeter for the sensor node and a Keweisi meter for the Gateway node. The number of repetitions of the data sending experiment for this network was determined by statistical calculations, projecting a total of 200 times. Obtaining the following data: 77.2m A, a flat text AES 128 of 77.9mA, AES 192 of 79.6mA, AES256 of 79.8mAy and RSA of 81.7mA, determining that the symmetric algorithm AES 128 provides a balance between data protection and consumption energetic.