Avaya 3.7 ユーザーズマニュアル

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Certificate Authority
314 Avaya VPNmanager Configuration Guide Release 3.7
Certificate Authority
A trusted company or organization that serves as a repository of digital 
certificates. Once a CA accepts your public key (with some other proof of 
identity), others can then request verification of your public key. 
Certificates
Issuer
Issuer Certificates also reside in the security gateway and are used to 
authenticate the other side. For example, if the Directory Server presents a 
certificate for an SSL session, the security gateway must have an Issuer 
Certificate that can verify the VPNmanager’s certificate is valid. Devices 
wishing to use IKE must be validated with an Issuer Certificate. All Issuer 
certificates are public.
My Certificates
My Certificates is a list of nine (0 through 8) certificates that exist inside the 
security gateway and are used to identify the security gateway to an opposite 
endpoint. Requires generation of a public/private key pair where the private key 
never leaves the security gateway. 
Signing
Similar to the security gateways Issuer Certificates necessary to verify the 
VPNmanager Certificate, the Signing Certificates are for the VPNmanager 
Console to verify the security gateway Certificate.
Certificate 
Revocation List 
(CRL), checking
Certificate Revocation List checking looks to a directory server (maintained by 
CAs) to validate a new certificate by searching a list of no longer valid digital 
certificates. 
D
DCI
Direct Configuration Interface is a Avaya Inc. proprietary protocol developed to 
facilitate passing setup and configuration data between the VPNmanager 
console and the security gateway. DCI traffic can pass in the clear if the LAN on 
which they both reside is behind a firewall, or over SSL if not.
DES
Data Encryption Standard (DES) is a block-cipher algorithm created by IBM 
used to rapidly encrypt large amounts of data at one time. The technique uses a 
56-bit key and operates on blocks of 64 bits. See 
Diffie-Hellman
A popular mechanism used to define the mathematical parameters used during 
IKE negotiations. Group 1 specifies use of a 768 bit modulus, Group 2 a 1024 
bit modulus (Group 2 is “more secure”).
Digital Certificate
An electronic document used to establish a company’s identity by verifying its 
public key. Digital Certificates are issued by a certificate authority.
Domain Name 
Service (DNS)
The network service that converts text-based names into numeric IP addresses 
and vice-versa.
Domains, VPN
A VPN Domain is a collection of Virtual Private Network devices that compose 
a Virtual Private Network.