ZyXEL Communications USG110 User Manual Download

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Chapter 43 Object

ZyWALL USG Series User’s Guide

887

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), State (ST), 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.

“none” displays for a certification request.

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 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. “none” displays for a
certification request.

Valid To

This field displays the date that the certificate expires. The text displays in red and includes
an Expired! message if the certificate has expired. “none” displays for a certification
request.

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. This field
does not display for a certification request.

MD5 Fingerprint

This is the certificate’s message digest that the Zyxel Device calculated using the MD5
algorithm.

SHA1 Fingerprint

This is the certificate’s message digest that the Zyxel Device calculated using the SHA1
algorithm.

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 lowercase letters, uppercase letters and numerals to convert a
binary certificate into a printable form.

You can copy and paste a certification request into a certification authority’s web page,
an e-mail that you send to the certification authority or a text editor and save the file on a
management computer for later manual enrollment.

You can copy and paste a certificate into an e-mail to send to friends or colleagues or you
can copy and paste a certificate into a text editor and save the file on a management
computer for later distribution (via floppy disk for example).

ZyXEL Communications USG110, User Manual

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