O texto abaixo descreve um sistema de segurança para computadores desenvolvido por pesquisadores da Universidade Estadual do Novo México. Considere-o para responder à questão.

S E C U R I T Y

Personality Type

ONE SIMPLE way to improve computer security may lie at your fingertips - but it’s not your fingerprints. Rather, your typing style may someday be the key to keeping snoops out of your computer.

At least that’s the conclusion of New Mexico State University professor Juris Reinfelds, who contends that the way a person tickles the computer keyboard is a highly individual trait, and one that remains stable over time. Reinfelds and two colleagues have developed a security system that uses typing rhythms to guard against unauthorized computer access.

The system works by monitoring the pace of keystrokes. A timing device traps keyboards signals before they reach the computer processor. This box then sends out two signals of its own - one that goes to the computer, and another that shows how many milliseconds have elapsed since the last keystroke. If the typing pattern varies from the recognized one, the computer prompts you to type a few lines of text. If the patterns still don’t match, further access is denied. The researchers claim the system spots intruders 99 percent of the time and even detects unauthorized users after you have entered a password.

- Linda Wasmer Smith

(New Scientist, 20/07/1996.)

O que os pesquisadores tomaram como base para elaborar o sistema? Por quê?