ZyXEL 802.11g Bedienungsanleitung PDF herunterladen (Seite 233)

100

101

P-662H/HW-D Series User’s Guide

Chapter 15 Introduction to IPSec 233

CHAPTER 15

Introduction to IPSec

This chapter introduces the basics of IPSec VPNs.

15.1 VPN Overview

A VPN (Virtual Private Network) provides secure communications between sites without the

expense of leased site-to-site lines. A secure VPN is a combination of tunneling, encryption,

authentication, access control and auditing technologies/services used to transport traffic over

the Internet or any insecure network that uses the TCP/IP protocol suite for communication.

15.1.1 IPSec

Internet Protocol Security (IPSec) is a standards-based VPN that offers flexible solutions for

secure data communications across a public network like the Internet. IPSec is built around a

number of standardized cryptographic techniques to provide confidentiality, data integrity and

authentication at the IP layer.

15.1.2 Security Association

A Security Association (SA) is a contract between two parties indicating what security

parameters, such as keys and algorithms they will use.

15.1.3 Other Terminology

15.1.3.1 Encryption

Encryption is a mathematical operation that transforms data from "plaintext" (readable) to

"ciphertext" (scrambled text) using a "key". The key and clear text are processed by the

encryption operation, which leads to the data scrambling that makes encryption secure.

Decryption is the opposite of encryption: it is a mathematical operation that transforms

“ciphertext” to plaintext. Decryption also requires a key.

1 2 ... 228 229 230 231 232 233 234 235 236 237 238 ... 495 496

Kommentare zu diesen Handbüchern

Keine Kommentare

ZyXEL 802.11g Bedienungsanleitung Seite 233

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Vernetzung ZyXEL 802.11g