security is a system, not a specific attack or defense a system has many subsystems; they interact security is like programming murphy´s law security is about people security is about economics human are at the point where machines are our backup the security level for my pen is i carry four of them people you must trust, they are in every security system (bruce schneier)

he has a new book, beyond fear and a blog

look what animals do for their security, schneier suggests and adds: one think they do is replication, backups so to say; if they are many they don't care if they loose some.

brave new world beyond fear.