User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 10 – Online transaction messages with DUKPT 2015-04-20
Page257
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message 94 Load Second Initial Key Request
Format: <STX>94[IPEK][KSN]<ETX>[LRC]
<STX>90[TR-31 Key Block]<ETX>[LRC] (Encrypted)
Message length: Fixed 41 or 57 bytes for clear text format, 93 or 109 bytes for TR-31 format.
Usage: Load second set of DUKPT initial key and serial number key to PP791. Consequent
keys will be generated using provided data.
Note: Refer to message 90.
Message element:
(Clear Text Format)
Field Length Value and description
<STX> 1 <02>
94 2 Message ID
[IPEK] 16 or
32
Initial PIN encryption key.
32-characters Initial key will make
PP791 act in TDES DUKPT mode.
Format: hexadecimal string.
[KSN] 20 Key serial number used in generating
consequent keys.
Format: hexadecimal string.
<ETX> 1 <03>
[LRC] 1 Checksum
(Encrypted format)
Field Length Value and description
<STX> 1 <02>
94 2 Message ID
[TR-31 Key
Block]
88 or
104
TR-31 key block with optional header
block that contains KSN.
See Appendix A for detail.
<ETX> 1 <03>
[LRC] 1 Checksum