Appendix G: Example Of Idtech Raw Data Decryption - IDTECH SecureHead User Manual

11. APPENDIX G: EXAMPLE OF IDTECH RAW DATA DECRYPTION

Original Raw Data Forward Direction:
01D67C81020408102D4481020408102042890A350854A2FB3EE4BA3D4065B67A9C391F582A42B9
9A858A90AF60852B14AA628A0D
028FC210842C18421084030092040B51581F24B56074404811160D
Original Raw Data Backward Direction:
01A28CAA51A9420DEA12A342B33A84A835F13872BCDB4C0578BA4EF9BE8A542158A12284081
020408102456810204081027CD60D
02D11024045C0D5A49F03515A0409201804210843068421087E20D
Note:
1. There is track number before each track. Track 1 is 01, Track 2 is 02, Track 3 is 03.
2. There is track separator after each track: 0D
Example of decryption of a two track ABA card with the original encryption format. For both Fix
& DUKPT key management.
SecureHead Reader with default settings
Key for all examples is
0123456789ABCDEFFEDCBA9876543210
Original Encryption Format
original encryption format (this can be recognized because the high bit of the fourth byte underlined (00)
is 0.
028700041B331A0027D2E435CEE303F007E977B598B7E3C57C76F4445E309F6916C0321A0F915B6
E490813498839049FE5204762327C3C758C5BF82542DEEDD8D6AF88019149A702FF2D43BD4AD6
0031FA450720B00D7808E15F3D5B29AE712C64A1212E9AF6F483BD40798A9FF2DDE77D046620B
55BCE94A4D5534CF57E7E07629949011A0000000001871D03
STX, Length (LSB, MSB), card type, track status, length track 1, length track 2, length track 3
02 8700 04 1B 33 1A 00
Track 1 & 2 encrypted length 0x33+0x1A rounded up to 8 bytes =0x4D -> 0x50 (80 decimal)
27D2E435CEE303F007E977B598B7E3C57C76F4445E309F6916C0321A0F915B6E490813498839049
FE5204762327C3C758C5BF82542DEEDD8D6AF88019149A702FF2D43BD4AD60031FA450720B00
D7808
Track 1 hashed
E15F3D5B29AE712C64A1212E9AF6F483BD40798A
Track 2 hashed
9FF2DDE77D046620B55BCE94A4D5534CF57E7E07
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