ZyXEL p-2802h-i1 Manuel D’Utilisation

 Chapter 15 Certificates

P-2802H(W)(L)-I Series User’s Guide

Version

This field displays the X.509 version number. 

Serial Number

This field displays the certificate’s identification number given by the device 

that created the certificate.

Subject

This field displays information that identifies the owner of the certificate, such 

as Common Name (CN), Organizational Unit (OU), Organization (O) and 

Country (C). 

Issuer

This field displays identifying information about the default self-signed 

certificate on the ZyXEL Device that the ZyXEL Device uses to sign the trusted 

remote host certificates.

Signature Algorithm

This field displays the type of algorithm that the ZyXEL Device used to sign the 

certificate, which is rsa-pkcs1-sha1 (RSA public-private key encryption 

algorithm and the SHA1 hash algorithm). 

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 ZyXEL Device 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 ZyXEL Device calculated using 

the MD5 algorithm. You cannot use this value to verify that this is the remote 

host’s actual certificate because the ZyXEL Device has signed the certificate; 

thus causing this value to be different from that of the remote hosts actual 

certificate. See 

 for how to verify a remote host’s 

certificate.

 

SHA1 Fingerprint

This is the certificate’s message digest that the ZyXEL Device calculated using 

the SHA1 algorithm. You cannot use this value to verify that this is the remote 

host’s actual certificate because the ZyXEL Device has signed the certificate; 

thus causing this value to be different from that of the remote hosts actual 

certificate. See 

 for how to verify a remote host’s 

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).

Back

Click Back to return to the previous screen.

Export

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.

Table 93   Trusted Remote Host Details (continued)