ZyXEL p-660hwp Manuale Utente

Chapter 13 Certificates

P-660HWP-Dx User’s Guide

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 P-660HWP-Dx that the P-660HWP-Dx uses to sign the 

trusted remote host certificates.

Signature Algorithm

This field displays the type of algorithm that the P-660HWP-Dx 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 P-660HWP-Dx 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 P-660HWP-Dx calculated 

using the MD5 algorithm. The P-660HWP-Dx 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 P-660HWP-Dx.

 

SHA1 Fingerprint

This is the certificate’s message digest that the P-660HWP-Dx calculated 

using the SHA1 algorithm. The P-660HWP-Dx 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 P-660HWP-Dx.

 

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).

Back

Click Back to go to the previous screen

Export

Click Export to export a file containing the details of your certificate.

Apply

Click Apply to save your changes back to the P-660HWP-Dx. You can only 

change the name of the certificate.

Cancel

Click Cancel to quit configuring this screen and return to the Trusted Remote 

Hosts screen.

Table 80   Security > Certificates > Trusted Remote Hosts > Details (continued)