1. ISO 8583 Basic
Presenter: Hieu Minh Nguyen

2. ISO8583

Financial transaction card originated messages
Interchange message specifications is the International
Organization for Standardization standard for systems
that exchange electronic transactions made by
cardholders using payment cards

The objective of this protocol is to transmit information
for payment processing through a network, usually
using TCP/IP sockets. An ISO8583 message can have
up to 63 or 127 fields and is processed in a linear way,
that is, the message can be processed as it is being read.

3. Structure ISO8583

We can separate the message into 3 parts:
− Message Type Identifier(MTI)
− Bitmaps
− Data Elements

4. Message Type Identifier

Message Type Identifier or MTI is 4 digits numeric
that describe the message type. It will explain the
message function.
− ISO 8583 version
− Message class
− Message function
− Message origin

5. ISO 8583 version

Position one of the MTI specifies the versions of the
ISO 8583 standard which is being used to transmit
the message.

6. Message class

Position two of the MTI specifies the overall
purpose of the message.

7. Message function

Position three of the MTI specifies the message
function which defines how the message should
flow within the system.

8. Message origin

Position four of the MTI defines the location of the
message source within the payment chain.

9. Message Type Identifier(Example)

10. Bitmaps

Within ISO 8583, a bitmap is a field or subfield
within a message which indicates which other data
elements or data element subfields may be present
elsewhere in a message.

A message will contain at least one bitmap, called
the Primary Bitmap which indicates which of Data
Elements 1 to 64 are present. A secondary bitmap
may also be present, generally as data element one
and indicates which of data elements 65 to 128 are
present.

11. Bitmaps(Example)

12. Data elements

Data elements are the individual fields carrying the
transaction information.

Each data element has a specified meaning and
format, the standard also includes some general
purpose data elements and system- or country-
specific data elements

Each data element is described in a standard format
which defines the permitted content of the field
(numeric, binary, etc.) and the field length (variable
or fixed)

13. Data elements

14. Data elements

Additionally, each field may be either fixed or
variable length.

15. Data elements

16. ISO 8583 Example

Examples Message
210040300041808100000599501100000000001200
805020723006015070000000070112222ABC00000
000000010190000000530000000001

The components that form it, and the results are
bitmap consists of 16 bit characters cause the first
bit of the decimal 7 (0100) is ’0 ‘so identified
without secondary bitmap

17. ISO 8583 Example

The components that form it, and the results are as
follows:

18. ISO 8583 Example

Each character in the
bitmap in-unpack into 4
binary characters.

These elements exist in
the data-elements are
elements to: 2, 11, 12, 26,
32, 33, 41, 48 (Position of
value “1″is read from left
to the right column to
unpack binary)

19. ISO 8583 Example
Each position is worth ’1 ‘at the
unpacked-Bitmap have data
elements that correspond to
components of data-
elements.Data elements:
05995011000000000012008050
207230060150700000000701
07
12222ABC000000000000101
90000000530000000001