ZyXEL Communications ZyWALL USG 100 Series Manual Download

Page: 803 / 1157

Chapter 46 Certificates

ZyWALL USG 100/200 Series User’s Guide

803

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.

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 information as in the

Subject Name

field.

Signature
Algorithm

This field displays the type of algorithm that was used to sign the
certificate. Some certification authorities use rsa-pkcs1-sha1 (RSA
public-private key encryption algorithm and the SHA1 hash
algorithm). Other certification authorities may use rsa-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 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.

ZyXEL Communications ZyWALL USG 100 Series, Manual

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