Vpn Encryption - D-Link NetDefendOS User Manual

2. Client to LAN connection - Where many remote clients need to connect to an internal
network over the Internet. In this case, the internal network is protected by the NetDefend
Firewall to which the client connects and the VPN tunnel is set up between them.

9.1.2. VPN Encryption

Encryption of VPN traffic is done using the science of cryptography. Cryptography is an umbrella
expression covering 3 techniques and benefits:
Confidentiality
Authentication and Integrity
No one but the intended recipients is able to receive and
understand the communication.
accomplished by encryption.
Proof for the recipient that the communication was actually
sent by the expected sender, and that the data has not
been modified in transit. This is accomplished by
authentication, and is often implemented through the use
of cryptographic keyed hashing.
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Chapter 9: VPN
Confidentiality is