<p>One of the most striking features of the 21st century is the widespread adoption of information technology in every aspect of the modern life of individuals, society, or nation-states.<br>When compared to land, sea, air, and space, cyberspace has unique features. Its ""geography"" is easily modified, oceans and mountains are hard to be changed, but entire cyberspace regions can be turned on or off with a button click. Moreover, anonymity, the ...