"Schneier skilfully guides readers through serious attacks that have happened already — and moves on to those he believes are just over the horizon... This book is convincing, but not comforting."

- Financial Times,

"Schneier’s book is sober, lucid and often wise in diagnosing how the security challenges posed by the expanding Internet came about, and in proposing what should (but probably won’t) be done about them."

- Nature,

"... excellent work..."

- The Catholic Herald,