ZyXEL Communications ZyWALL 300 User Manual

Chapter 40 Certificates

ZyWALL USG 300 User’s Guide

Click Object > Certificate > Trusted Certificates > Import to open the Trusted 
Certificates Import screen. Follow the instructions in this screen to save a trusted certificate 
to the ZyWALL.

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You must remove any spaces from the certificate’s filename before you can 
import the certificate.

Valid From

This field displays the date that the certificate becomes applicable. The text 
displays in red and includes a Not Yet Valid! message if the certificate has not 
yet become applicable.

Valid To

This field displays the date that the certificate expires. The text displays in red 
and includes an Expiring! or Expired! message if the certificate is about to expire 
or has already expired.

Key Algorithm

This field displays the type of algorithm that was used to generate the 
certificate’s key pair (the ZyWALL uses RSA encryption) and the length of the 
key set in bits (1024 bits for example).

Subject Alternative 
Name

This field displays the certificate’s owner‘s IP address (IP), domain name (DNS) 
or e-mail address (EMAIL).

Key Usage

This field displays for what functions the certificate’s key can be used. For 
example, “DigitalSignature” means that the key can be used to sign certificates 
and “KeyEncipherment” means that the key can be used to encrypt text.

Basic Constraint

This field displays general information about the certificate. For example, 
Subject Type=CA means that this is a certification authority’s certificate and   
“Path Length Constraint=1” means that there can only be one certification 
authority in the certificate’s path.

MD5 Fingerprint

This is the certificate’s message digest that the ZyWALL calculated using the 
MD5 algorithm. You can use this value to verify with the certification authority 
(over the phone for example) that this is actually their certificate.

 

SHA1 Fingerprint

This is the certificate’s message digest that the ZyWALL calculated using the 
SHA1 algorithm. You can use this value to verify with the certification authority 
(over the phone for example) that this is actually their certificate.

Certificate in PEM 
(Base-64) Encoded 
Format

This read-only text box displays the certificate or certification request in Privacy 
Enhanced Mail (PEM) format. PEM uses 64 ASCII characters to convert the 
binary certificate into a printable form. 
You can copy and paste the certificate into an e-mail to send to friends or 
colleagues or you can copy and paste the certificate into a text editor and save 
the file on a management computer for later distribution (via floppy disk for 
example).

Export Certificate

Click this button and then Save in the File Download screen. The Save As 
screen opens, browse to the location that you want to use and click Save.

OK

Click OK to save your changes back to the ZyWALL. You can only change the 
name.

Cancel

Click Cancel to quit and return to the Trusted Certificates screen.

Table 189   Object > Certificate > Trusted Certificates > Edit (continued)