
386 Cloud ComPuting networking
10.4 VPN Security
For security, a VPN provides various authentication and encryption methods to pro-
tect private data being transmitted over a public network. is section rst introduces
the methods commonly used in VPN authentication. en, it examines a few com-
monly used VPN encryption methods.
10.4.1 VPN Authentication
Before the data transaction through a VPN tunnel can get started, the connection
between the VPN server and VPN client needs to be authenticated. VPN authentica-
tion is the mechanism that validates the legitimacy of users or computers that access
the VPN server. When a VPN client requests a connect ...