Chapter 19 Certificates

Table 122 Trusted CA Details (continued)

LABEL

DESCRIPTION

Subject Alternative

This field displays the certificate’s owner‘s IP address (IP), domain name (DNS)

Name

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

This field displays how many directory servers with Lists of revoked certificates

Points

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

This read-only text box displays the certificate or certification request in Privacy

(Base-64) Encoded

Enhanced Mail (PEM) format. PEM uses 64 ASCII characters to convert the

Format

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.

 

 

19.11 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.

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P-2602HWLNI User’s Guide