ZyXEL Communications Internet Security Gateway ZyWALL 100, User Manual

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ZyWALL Series Internet Security Gateway
16-22 Certificates
Table 16-6 Trusted CA Details
LABEL DESCRIPTION
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 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.
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 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.