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  1. 1. ISO 8583 BasicPresenter: Hieu Minh Nguyen
  2. 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. 3. Structure ISO8583 We can separate the message into 3 parts: − Message Type Identifier(MTI) − Bitmaps − Data Elements
  4. 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. 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. 6. Message class Position two of the MTI specifies the overall purpose of the message.
  7. 7. Message function Position three of the MTI specifies the message function which defines how the message should flow within the system.
  8. 8. Message origin Position four of the MTI defines the location of the message source within the payment chain.
  9. 9. Message Type Identifier(Example)
  10. 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. 11. Bitmaps(Example)
  12. 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. 13. Data elements
  14. 14. Data elements Additionally, each field may be either fixed or variable length.
  15. 15. Data elements
  16. 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. 17. ISO 8583 Example The components that form it, and the results are as follows:
  18. 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. 19. ISO 8583 ExampleEach 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