
1
Chapter 1
Introduction
The growth of distributed computing has been one of the major drivers of
network security. With the exponential growth of networks, the ease with
which information can be shared between and among computers makes
security more important but more difficult to implement and manage. Also,
computers are no longer connected to one trusted network; they are potentially
connected to every other network and its computers in the world, with or
without security implementations of their own.
In the old mainframe environment, security meant keeping the computer
in a locked room with limited access. As computing power and its physical
presence ...