ZyXEL Communications MAX-207HW2R, Руководство пользователя

Страница: 131 / 150

Chapter 13 The Certificates Screens
MAX-207HW2R User’s Guide
131
Certification authorities maintain directory servers with databases of valid and
revoked certificates. A directory of certificates that have been revoked before the
scheduled expiration is called a CRL (Certificate Revocation List). The MAX-
207HW2R can check a peer’s certificate against a directory server’s list of revoked
certificates. The framework of servers, software, procedures and policies that
handles keys is called PKI (public-key infrastructure).
13.4.1.1 Advantages of Certificates
Certificates offer the following benefits.
• The MAX-207HW2R only has to store the certificates of the certification
authorities that you decide to trust, no matter how many devices you need to
authenticate.
• Key distribution is simple and very secure since you can freely distribute public
keys and you never need to transmit private keys.
13.4.1.2 Self-signed Certificates
You can have the MAX-207HW2R act as a certification authority and sign its own
certificates.
13.4.1.3 Factory Default Certificate
The MAX-207HW2R generates its own unique self-signed certificate when you first
turn it on. This certificate is referred to in the GUI as the factory default
certificate.
13.4.1.4 Certificate File Formats
Any certificate that you want to import has to be in one of these file formats:
• Binary X.509: This is an ITU-T recommendation that defines the formats for
X.509 certificates.
• PEM (Base-64) encoded X.509: This Privacy Enhanced Mail format uses
lowercase letters, uppercase letters and numerals to convert a binary X.509
certificate into a printable form.
• Binary PKCS#7: This is a standard that defines the general syntax for data
(including digital signatures) that may be encrypted. A PKCS #7 file is used to
transfer a public key certificate. The private key is not included. The MAX-
207HW2R currently allows the importation of a PKS#7 file that contains a single
certificate.
• PEM (Base-64) encoded PKCS#7: This Privacy Enhanced Mail (PEM) format uses
lowercase letters, uppercase letters and numerals to convert a binary PKCS#7
certificate into a printable form.
Note: Be careful to not convert a binary file to text during the transfer process. It is
easy for this to occur since many programs use text files by default.