Trusted Security Solutions

A98 ATM Initial Key Establishment System

A98 ISO8583 Message Format Specification

Version 3.0 (2005-09-21)

Table of Contents

A98 Overview

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 touch-tone 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.

This document explains the A98 Comvelope Solution ISO8583 Host Message format.

The A98-R Remote Key Solution communicates with the Host using XML format which is documented in the A98-R Remote Listener Configuration Guide.

ISO8583 Messages between the Host and the A98

ISO8583 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

A98 to System Echo

Receiving the Response from the Host

Sending the Key to the Host from the A98

Receiving the Response from the Host