National identity cards are in the news. While paper ID documents have been used in some countries for a long time, today's rapid growth features high-tech IDs with built-in biometrics and RFID chips. Both long-term trends towards e-Government and the more recent responses to 9/11 have prompted the quest for more stable identity systems. Commercial pressures mix with security rationales to catalyze ID development, aimed at accuracy, efficiency and speed. New ID systems also depend on computerized national registries. Many questions are raised about new IDs but they are often limited by...