Chapter 15 Certificates

Table 84 SECURITY > CERTIFICATES > Trusted CAs > Details (continued)

LABEL

DESCRIPTION

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 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.

 

 

SHA1 Fingerprint

This is the certificate’s message digest that the ZyWALL 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).

 

 

Apply

Click Apply to save your changes back to the ZyWALL. You can only change

 

the name and/or set whether or not you want the ZyWALL 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.

 

 

15.12 Trusted CA Import

Click SECURITY > CERTIFICATES > Trusted CAs to open the Trusted CAs screen and then click Import to open the Trusted CA Import screen. Follow the instructions in this screen to save a trusted certification authority’s certificate from a computer to the ZyWALL. The ZyWALL trusts any valid certificate signed by any of the imported trusted CA certificates.

"You must remove any spaces from the certificate’s filename before you can import the certificate.

314

 

ZyWALL 2 Plus User’s Guide