ZyXEL Communications 5 Series User Manual
Page 387
ZyWALL 5/35/70 Series User’s Guide
Chapter 19 Certificates
387
Type
This field displays general information about the certificate. With trusted remote
host certificates, this field always displays CA-signed. The ZyWALL is the
Certification Authority that signed the certificate. 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 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 ZyWALL that the ZyWALL uses to sign the trusted remote
host certificates.
Signature Algorithm
This field displays the type of algorithm that the ZyWALL 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 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. The ZyWALL uses one of its own self-signed certificates to sign
the imported trusted remote host certificates. This changes the fingerprint value
displayed here (so it does not match the original). See
for how to verify a remote host’s certificate before you import it into the
ZyWALL.
SHA1 Fingerprint
This is the certificate’s message digest that the ZyWALL calculated using the
SHA1 algorithm. The ZyWALL uses one of its own self-signed certificates to
sign the imported trusted remote host certificates. This changes the fingerprint
value displayed here (so it does not match the original). See
for how to verify a remote host’s certificate before you import it into
the ZyWALL.
Table 115 SECURITY > CERTIFICATES > Trusted Remote Hosts > Details (continued)
LABEL
DESCRIPTION