ZyXEL g-2000 plusv2 Guía Del Usuario

ZyXEL G-2000 Plus v2 User’s Guide

Chapter 16 Certificates

209

Certificate Path

Click the Refresh button to have this read-only text box display the hierarchy of 

certification authorities that validate the certificate (and the certificate itself).
If the issuing certification authority is one that you have imported as a trusted 

certification authority, it may be the only certification authority in the list (along 

with the certificate itself). If the certificate is a self-signed certificate, the 

certificate itself is the only one in the list. The ZyXEL device does not trust the 

certificate and displays “Not trusted” in this field if any certificate on the path has 

expired or been revoked.

Refresh

Click Refresh to display the certification path.

Certificate 

Information

These read-only fields display detailed information about the certificate. 

Type

This field displays general information about the certificate. CA-signed means 

that a Certification Authority signed the certificate. Self-signed means that the 

certificate’s owner signed the certificate (not a certification authority).  “X.509” 

means that this certificate was created and signed according to the ITU-T X.509 

recommendation that defines the formats for public-key certificates.

Version

This field displays the X.509 version number. 

Serial Number

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

authority or generated by the ZyXEL device.

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 certificate’s issuing 

certification authority, such as Common Name, Organizational Unit, 

Organization and Country. 
With self-signed certificates, this is the same as the Subject Name field.

Signature Algorithm

This field displays the type of algorithm that was used to sign the certificate. The 

ZyXEL device uses rsa-pkcs1-sha1 (RSA public-private key encryption 

algorithm and the SHA1 hash algorithm). Some certification authorities may use 

ras-pkcs1-md5 (RSA public-private key encryption algorithm and the MD5 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 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. 

Table 70   My Certificate Details (continued)