Appendix C – ARQC Response Message Format
aDynamo, uDynamo, Dynamag, DynaMAX, eDynamo, BulleT, mDynamo| Secure Card Reader Authenticator | .NET/PCL Programmer’s
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Appendix C
ARQC Response Message Format
This section gives the format of the data for the Online Processing Result / Acquirer Response message.
This request is sent to the reader in response to an ARQC Message notification from the reader. The
output is controlled by Property 0x68 – EMV Message Format. There are currently 2 selectable formats:
Original and DynaPro. It is a TLV object with the following contents.
Original format:
F9<len>/* container for ARQC Response data */
DFDF25 (IFD Serial Number)<len><val>
FA<len>/* Container for generic data */
70<len>/* Container for ARQC */
8A<len> approval
Further objects as needed...
DynaPro format:
F9<len>/* container for MAC structure and generic data */
DFDF54 (MAC KSN)<len><val>
DFDF55 (Mac Encryption Type><len><val>
DFDF25 (IFD Serial Number)<len><val>
FA<len>/* Container for generic data */
70<len>/* Container for ARQC */
8A<len> approval
(ARQC padding, if any, to be a multiple of 8 bytes)
CBC-MAC (4 bytes, use MAC variant of MSR DUKPT key that was used in ARQC request, from
message length up to and including ARQC padding, if any
