Trusted Security Solutions

A98 ATM Initial Key Establishment System

A98 ISO8583 Message Format Specification

Version 1.4 (2000-05-02)

A98 Overview

Trusted Security Solutions, Inc. was formed by Abraham & Associates, Inc. and J.S. Walker & Company, Inc. for the purpose of bringing unique security solutions to the transaction processing industry.

Abraham & Associates, Inc. located in Concord, North Carolina specializes in consulting services for the financial transaction processing industry with an emphasis on PIN based transactions.

J.S. Walker & Company, Inc. located in Charlotte, North Carolina specializes in providing consulting services and the development of automation solutions for financial institutions, insurance companies and related businesses.

Trusted Security Solutions, Inc. is offering the A98 ATM Initial Key Establishment System to institutions that manage the cryptographic keys for ATMs. A98 works with all ATMs, requires no hardware or programming changes to the ATMs and avoids the cumbersome requirements normally associated with compliant key management. Service personnel communicate with the A98 system via a touchtone telephone to establish the initial ATM keys in a manner which is fully compliant with the applicable ANSI standards and network operating rules. Once established, the initial keys are securely communicated to the host computer that drives the ATMs. All activity and events are securely logged and detailed reports provide concise audit tail information.

The A98 System is packaged in a standard 19” locking rack-mounted enclosure. All information is mirrored to a second hard drive under hardware control. Additional backup and recovery is available using an optional redundant A98 System Unit. The locked and pluggable hard drives are removed from the failing A98 System Unit and plugged into the redundant A98 System Unit to provide fast recovery.

Table of Contents

Messages Between the Host and the A98

ISO-8583 Message Format for A98 to Host Connection

General Messaging Format

General Field Definitions

Message Flow Protocol

A98 System to Host Sign-On

Receiving the Response from the Host

A98 System to Host Sign-Off

Receiving the Response from the Host

Sending the Key to the Host from the A98

Receiving the Response from the Host

Updating the A98 Database

Message Flow Protocol

Sending the Database updates from the Host to the A98

Receiving the A98 Response at the Host

S72 and S101 Field Definitions and Syntax

Example A98 Database Functions

Adding an ATM

Changing the Type of an ATM

Adding a Servicer

Query a Servicer