Table of Contents - APTAStandards.com

standard does not mandate the compliance of transactions originating from Tier 1
devices. Following are some of the disadvantages of RIS Part 4.
• Limited support for data elements (objects) not compliant with WP1 data formats
• In a draft form and not implemented
4.9.3 Com mon Message
Structure
RIS messages consist of four
parts as shown in Exhibit 4.8-1. The total message length
varies based on the number of objects included in Part
3 of the message. Each
individual mes sage is iden tified by the “Message Identifier” and contains
the message
specific mandatory and optional data objects as designated by the object
map. The
details of these messages have been described in the following sections. 4.9.3.1 PART 1
Exhibit 4.9-1 RIS Message Structure
T he Part 1 consists of fixed number of fields within each message category described in
Section
4.9.4.
The “Message Identifier” determines type
of the message such as “Product Activation”
or
“Use of Stored Value”.
4.9.3.2 PART 2
The
Part 2 includes message authentication data represented by the
“AuthenticationDataGroup”. This group contains the data elements that will be
required by the receiver to authenticate the message or series of messages.
4.9.3.3
PART 3
Exhibit
4.9-9
AuthenticationDataGroup
MessageAuthCode
MACKeyID
AlgorithmID, optional
MACHashID, optional
This part contains the standard RIS object map and the objects required to be included
in a specific transaction. The purpose of the object map is similar to the “bitmap” in
ISO/IEC
8583, as explained in section 4.1.1. The Object Map is an 8 Byte, (64 Bit) binary
Page 67