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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1131Access security gateway
20
If the previously-called number was in an AD privileged list, and if the user
is not normally allowed to dial the number because of his or her class of
restriction, they cannot redial the number using Last Number Dialed. To
redial the number, the user must again access the AD privileged list.
Related topics
Refer to ‘‘
Adding abbreviated dialing lists’’ on page 79 for instructions on
creating abbreviated dialing lists.
Refer to ‘‘
Abbreviated Dialing List’’ on page 459 for detailed descriptions of the
fields on the abbreviated dialing screens.
Access security gateway
Access Security Gateway (ASG) prevents unauthorized access by requiring the
use of the ASG Key for logging into the system. The ASG Key can be:
■ a hand-held device, or
■ a software module you load on the PC you use for accessing the system.
Detailed Description
Authentication is successful only when DEFINITY ECS and ASG communicate
with a compatible key. The challenge/response negotiation starts after establishing
an RS-232 session and you enter a valid DEFINITY ECS login ID. The
authentication transaction consists of a challenge, issued by DEFINITY ECS and
based on the login ID entered by you, followed by the expected response, again
entered by you. The core of this transaction is a secret key, which is
information-possessed by both the lock (ASG) and the key. Interception of either
the challenge or response during transmission does not compromise the security
of the system. The relevance of the authentication token used to perform the
challenge/response is limited to the current challenge/response exchange
(session).
NOTE:
ASG does not protect login access to a Multiple Application Platform for
DEFINITY (MAPD).
The supported key consists of a hand-held encryption-generating device (ASG
Key). The key (response generator) device is pre-programmed with the
appropriate secret key to communicate with corresponding ASG protected login
IDs on DEFINITY ECS.