iso8583 - What to make mac with, in ISO 8583? -

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I want to create an ISO message with a field 64 message authentication code (MAC). I want to know what does the binary of the ISO message with MAC do without field 64? Or with the information set on the binary field 64 of the ISO message, but at the end of bitmap is showing a 1 that there is something in the field 64?

You should define the fields that you use in the Mac calculation. Select specific areas and apply your Mac-ING algorithm.

Normally, you can go through the following guidelines:

  1. Mac field in Mac calculations (F64 / F128) those areas contain results of the Mac; It will be guaranteed to include them in the calculation that the mac value will always be incompatible.

  2. Try to use the mandatory field, i.e. that you (or ISO) has compulsory form for the message All you have to do is type the name you are looking for in Mac to include some vendors (such as ACI, base 24), message headers, message type identifier (MTI) and primary bitmap mac calculation.

Eventually, you should select just a few areas guaranteed and apply your Mac-Inning Algorithm. What is enabled without flagging the F64?


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