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Chapter 14 Certificates
ZyXEL NWA-3160 Series User’s Guide
172
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.
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 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’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.
CRL Distribution
Points
This field displays how many directory servers with Lists of revoked certificates
the issuing certification authority of this certificate makes available. This field
also displays the domain names or IP addresses of the servers.
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 host’s actual
certificate. See Section 14.3 on page 158 for how to verify a remote host’s
certificate before you import it into the ZyXEL Device.
Table 63 Trusted CA Details (continued)
LABEL DESCRIPTION