1
1
Security of computer
NetworkS
e objective of this chapter is to present the different mod-
els concerning the risks of different aspects of attacks: physical,
data and data transmission, and network. ese risks have led to
development of effective means of defense. We will emphasize
the protection of data and its transmission across the network to
ward off unauthorized access.
1.1 General Overview on Different Risks forand
Means of Computer Defense
Security is defined by Lanctot (1997) as “a set of conditions and
ways of acting.” is set allows the user of a computer to accom-
plish, without interference, the desired tasks. According to Guy
Pujolle (2003), security is considered “an essential function of net-
works since we are not able to see di ...