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Page 40 of 74
SecureMag User Manual
10.4
DUKPT Level 4 Data Output Original Format
For ISO card, both clear and encrypted data are sent. For other card, only clear
data are sent.
A card swipe returns the following data:
Card data is sent out in format of
<STX><LenL><LenH><Card Data><CheckLRC><CheckSum><ETX>
<STX> = 02h, <ETX> = 03h
<LenL><LenH> is a two byte length of <Card Data>.
<CheckLRC> is a one byte Exclusive-OR sum calculated for all <Card Data>.
<CheckSum> is a one byte Sum value calculated for all <Card data>.
<Card Data> format is
ISO/ABA Data Output Format:
card encoding type
(0: ISO/ABA, 4: for Raw Mode)
track status
(bit 0,1,2:T1,2,3 decode, bit
3,4,5:T1,2,3 sampling)
track 1 unencrypted length
(1 byte, 0 for no track1 data)
track 2 unencrypted length
(1 byte, 0 for no track2 data)
track 3 unencrypted length
(1 byte, 0 for no track3 data)
if card encoding type high bit set
■
mask and clear sent track status
■
encrypt and hash sent track status
In this mode tracks are encrypted separately rather than as a group
track 1 masked
(Omitted if in Raw mode)
track 2 masked
(Omitted if in Raw mode)
track 3 data
(Omitted if in Raw mode)
track 1&2 encrypted
(AES/TDES encrypted data)
sessionID encrypted
(AES/TDES encrypted data)
track 1 hashed
(20 bytes SHA1-Xor)
track 2 hashed
(20 bytes SHA1-Xor)
track 3 hashed (optional)
(20 bytes SHA1-Xor)
DUKPT serial number
(10 bytes)
Non ISO/ABA Data Output Format:
card encoding type
(1: AAMVA, 3: Others)
track status
(bit 0,1,2:T1,2,3 decode, bit
3,4,5:T1,2,3 sampling)
track 1 length
(1 byte, 0 for no track1 data)
track 2 length
(1 byte, 0 for no track2 data)
track 3 length
(1 byte, 0 for no track3 data)
track 1 data
