Little Brother by Cory Doctorow

Shortly after a terrorist attack, Marcus Yallow is arrested and held by the Department of Homeland Security. Marcus is released and engages in a technological battle with the government to stop the encroachment of civil rights enacted in the name of safety and security. Doctorow uses the story of Marcus and his friends to question just how much freedom should we forgo for protection against terrorists, a debate that is important in maintaining our freedom.