Nortel BSR222, Configuration, Page: 283 / 451

Chapter 14 Certificates 283
Nortel Business Secure Router 222 Configuration — Basics
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 can use rsa-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 Business Secure Router uses RSA
encryption) and the length of the key set in bits (1 024-bits, for
example).
Subject
Alternative Name This (optional) 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 Business Secure
Router 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 a valid certificate.
SHA1 Fingerprint This is the certificate’s message digest that the Business Secure
Router 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 a valid certificate.
Table 72 Trusted CA details
Label Description