ZyXEL Communications 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series, User Manual

Page: 280 / 496

P-662H/HW-D Series User’s Guide
280 Chapter 17 Certificates
17.11 Trusted Remote Hosts
Click Security > Certificates > Trusted Remote Hosts to open the Trusted Remote Hosts
screen. This screen displays a list of the certificates of peers that you trust but which are not
signed by one of the certification authorities on the
Trusted CAs screen.
You do not need to add any certificate that is signed by one of the certification authorities on
the
Trusted CAs screen since the ZyXEL Device automatically accepts any valid certificate
signed by a trusted certification authority as being trustworthy.
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 can use this value to verify with the certification authority
(over the phone for example) that this is actually their certificate.
SHA1 Fingerprint This is the certificate’s message digest that the ZyXEL Device calculated using
the SHA1 algorithm. You can use this value to verify with the certification
authority (over the phone for example) that this is actually their certificate.
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 64 ASCII characters to convert the
binary certificate into a printable form.
You can copy and paste the certificate into an e-mail to send to friends or
colleagues or you can copy and paste the certificate into a text editor and save
the file on a management computer for later distribution (via floppy disk for
example).
Export Click this button and then Save in the File Download screen. The Save As
screen opens, browse to the location that you want to use and click Save .
Apply Click Apply to save your changes back to the ZyXEL Device. You can only
change the name and/or set whether or not you want the ZyXEL Device to check
the CRL that the certification authority issues before trusting a certificate issued
by the certification authority.
Cancel Click Cancel to quit and return to the Trusted CAs screen.
Table 107 Trusted CA Details (continued)
LABEL DESCRIPTION