ABSTRACT
Most of the challenges of cybersecurity can be traced back, ultimately, to the origins of the Internet in the research network called Arpanet. As well as being extremely large, the Internet is dynamic because devices come and go as they are turned on and off or fail, and because data flows over the momentarily best path between each source and destination. The distributed nature of Arpanet meant that, as it developed into the Internet, there was no central control of what would happen and how it would happen. Much of the security in the Internet is built around the metaphor of a castle-high, protective walls, with gates the constrain data movement, allowing it only with authentication. It is a truism that convenience always trumps security in practice. There is also little demand from Internet users for greater security, at least when counter-balanced by the lure of new Internet-based services.
