ZyXEL Communications P-660 series Guia do Utilizador descarregar pdf (Página 137)

Chapter 9 Certificates

P-660R-F1 Series User’s Guide

137

9.6 Certificates Technical Reference

This section provides technical background information about the topics covered in this chapter.

9.6.1 Certificates Overview

The ZyXEL Device can use certificates (also called digital IDs) to authenticate users. Certificates are

based on public-private key pairs. A certificate contains the certificate owner’s identity and public

key. Certificates provide a way to exchange public keys for use in authentication.

The ZyXEL Device uses certificates based on public-key cryptology to authenticate users attempting

to establish a connection, not to encrypt the data that you send after establishing a connection. The

method used to secure the data that you send through an established connection depends on the

type of connection. For example, a VPN tunnel might use the triple DES encryption algorithm.

The certification authority uses its private key to sign certificates. Anyone can then use the

certification authority’s public key to verify the certificates.

A certification path is the hierarchy of certification authority certificates that validate a certificate.

The ZyXEL Device does not trust a certificate if any certificate on its path has expired or been

revoked.

Certification authorities maintain directory servers with databases of valid and revoked certificates.

A directory of certificates that have been revoked before the scheduled expiration is called a CRL

(Certificate Revocation List). The ZyXEL Device can check a peer’s certificate against a directory

server’s list of revoked certificates. The framework of servers, software, procedures and policies

that handles keys is called PKI (Public-Key Infrastructure).

Server Port This field displays the default server port number of the protocol that you select

in the Access Protocol field.

You may change the server port number if needed, however you must use the

same server port number that the directory server uses.

389 is the default server port number for LDAP.

directory server. Type the login name (up to 31 ASCII characters) from the

entity maintaining the directory server (usually a certification authority).

Password Type the password (up to 31 ASCII characters) from the entity maintaining the

directory server (usually a certification authority).

Back Click this to return to the Directory Servers screen.

Apply Click this to save your changes.

Cancel Click this to restore your previously saved settings.

1. At the time of writing, LDAP is the only choice of directory server access protocol.

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ZyXEL Communications P-660 series Guia do Utilizador Página 137