推荐序 Computing and the internet have transformed humanity.We live in an extraordinary time--computers have amplified our capabilities and the internet has connected our species together.Software applications grant us all superpowers that our ancestors would have considered magical:we can access and search all information in seconds;we can talk face-to-face with anybody around the planet;we can broadcast our messages and speeches to everyone world-wide;and we have enhanced our minds with external computing and information storage.We have tremendous,awe-inspiring capabilities. The properties of the internet determine our capabilities.All of these powers hinge on the properties of the internet--if the internet breaks down,or is insecure,then so are our applications and our capabilities.We mus…