Chapter 33 Certificates
ZyWALL 110/310/1100 Series User’s Guide
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Additionally, Jenny uses her own private key to sign a message and Tim uses Jenny’s public key to
verify the message.
The ZyWALL uses certificates based on public-key cryptology to authenticate users attempting to
establish a connection, not to encrypt the data that you send after establishing a connection. The
method used to secure the data that you send through an established connection depends on the
type of connection. For example, a VPN tunnel might use the triple DES encryption algorithm.
The certification authority uses its private key to sign certificates. Anyone can then use the
certification authority’s public key to verify the certificates.
A certification path is the hierarchy of certification authority certificates that validate a certificate.
The ZyWALL does not trust a certificate if any certificate on its path has expired or been revoked.
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A directory of certificates that have been revoked before the scheduled expiration is called a CRL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 ZyWALL 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).
Advantages of Certificates
Certificates offer the following benefits.
• The ZyWALL 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.
Self-signed Certificates
You can have the ZyWALL act as a certification authority and sign its own certificates.
Factory Default Certificate
The ZyWALL 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.
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 ZyWALL 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.
Summary of Contents for ZyWALL 110 Series
Page 16: ...ZyWALL 110 310 1100 Series User s Guide 16...
Page 32: ...Chapter 1 Introduction ZyWALL 110 310 1100 Series User s Guide 32...
Page 42: ...Chapter 3 Hardware Introduction ZyWALL 110 310 1100 Series User s Guide 42...
Page 68: ...Chapter 4 Quick Setup Wizards ZyWALL 110 310 1100 Series User s Guide 68...
Page 176: ...Chapter 7 Interfaces ZyWALL 110 310 1100 Series User s Guide 176...
Page 186: ...Chapter 8 Trunk ZyWALL 110 310 1100 Series User s Guide 186...
Page 210: ...Chapter 10 Routing Protocols ZyWALL 110 310 1100 Series User s Guide 210...
Page 220: ...Chapter 12 DDNS ZyWALL 110 310 1100 Series User s Guide 220...
Page 228: ...Chapter 13 NAT ZyWALL 110 310 1100 Series User s Guide 228...
Page 240: ...Chapter 15 ALG ZyWALL 110 310 1100 Series User s Guide 240...
Page 246: ...Chapter 16 IP MAC Binding ZyWALL 110 310 1100 Series User s Guide 246...
Page 263: ...Chapter 18 Authentication Policy ZyWALL 110 310 1100 Series User s Guide 263...
Page 264: ...Chapter 18 Authentication Policy ZyWALL 110 310 1100 Series User s Guide 264...
Page 316: ...Chapter 20 IPSec VPN ZyWALL 110 310 1100 Series User s Guide 316...
Page 340: ...Chapter 22 SSL User Screens ZyWALL 110 310 1100 Series User s Guide 340...
Page 442: ...Chapter 36 DHCPv6 ZyWALL 110 310 1100 Series User s Guide 442...
Page 540: ...Appendix A Legal Information ZyWALL 110 310 1100 Series User s Guide 540...
Page 558: ...Index ZyWALL 110 310 1100 Series User s Guide 558...
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