One of the books I read when I was younger that got me into programming is Little Brother by Cory Doctorow. In the book, the high school they attend has cameras

One of the books I read when I was younger that got me into programming is Little Brother by Cory Doctorow. In the book, the high school they attend has cameras that identify students by measuring gait. The characters in the book put gravel in their shoes to throw the tech off when cutting class.