Chapter 18 Introduction To Ipsec; Vpn Overview; Ipsec; Security Association - ZyXEL Communications P-662HW-61 User Manual

18.1 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.

18.1.1 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.

18.1.2 Security Association

A Security Association (SA) is a contract between two parties indicating what security
parameters, such as keys and algorithms they will use.

18.1.3 Other Terminology

18.1.3.1 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.

Chapter 18 Introduction to IPSec

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H A P T E R
Introduction to IPSec
This chapter introduces the basics of IPSec VPNs.
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