Index -- Knowing Who's Who -- Data, systems and objects -- Cracking codes -- DNA computers -- Quantum computers -- Quantum Cryptography -- Splitting up the secret -- Hiding data in plain sight -- Finding hidden data -- Securing systems -- Recovering from an attack -- Securing the 'Net -- Exploiting the Internet -- Privacy -- Protecting property -- High visibility -- Biometrics -- Perpetually pursuing perfect security -- How It Works 2 -- Cryptography -- Quantum Cryptography -- Data Hiding -- Systems and Software Defense -- Internet Vulnerabilities -- Privacy Protection -- Physical Security -- Glowing Beads Make Tiny Bar Codes.