
Chapter 13 VPN 201
Nortel Business Secure Router 252 Configuration — Basics
Security Association
A Security Association (SA) is a contract between two parties indicating which
security parameters, such as keys and algorithms, they use.
Other terminology
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.
Figure 63 Encryption and decryption
Table 44 VPN Screens Overview
Screens Description
Summary This screen lists all of your VPN rules.
Contivity Client
Rule Setup
Use these screens to configure simple VPN rules that
have the Business Secure Router operate as a VPN
client.
Branch Office
Rule Setup
Use these screens to manually configure VPN rules
that have the Business Secure Router operate as a
VPN router.
SA Monitor Use this screen to display and manage active VPN
connections.
Global Setting Use this screen to configure the IPSec timer settings.
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