Appendix F: Example Of Decoded Data Decryption - IDTECH SecureHead User Manual

SecureHead SPI Interface with FPC User Manual

10. APPENDIX F: EXAMPLE OF DECODED DATA DECRYPTION

Key for all examples is
0123456789ABCDEFFEDCBA9876543210
Security Level 3 Decryption - Original Encryption Format
Example of decryption of a three track ABA card with the original encryption format.
SecureHead Reader with default settings
Original encryption structure (if your structure starts original encryption format (this can be recognized
because the high bit of the fourth byte underlined (00) is 0.
027D01003F48236B252A343236362A2A2A2A2A2A2A2A393939395E42555348204A522F47454F524
74520572E4D525E2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A
2A2A2A3F2A3B343236362A2A2A2A2A2A2A2A393939393D2A2A2A2A2A2A2A2A2A2A2A2A2A2
A2A3F2A3B33333333333333333333373637363736303730373037373637363736333333333333333333
3337363736373630373037303737363736373633333333333333333333373637363736303730373037373
63736373633333333333333333333373637363736303730373F32863E9E3DA28E455B28F7736B77E47
A64EDDA3BF03A06E44F31D1818C0BCD7A353FB1AD70EFD30FFC3DA08A4FBC9372E57E8B408
48BAEAA3FE724B3550E2F4B223E6BF264BEAE9E39142B648CDB51FB8DAF8EA5B63913D29419
B67582FCCCE9B372660F03668CC453216D9449C6B67EF33418AC88F65E1DB7ED4D10973F99DF
C8463FF6DF113B6226C4898A9D355057ECAF11A5598F02CA3162994901190000000001399F03
STX, Length (LSB, MSB), card type, track status, length track 1, length track 2, length track 3
02 7D01 00 3F 48 23 6B
The above broken down and interpreted
02—STX character
7D—low byte of total length
01—high byte of total length
00—card type byte (interpretation old format ABA card)
3F—3 tracks of data all good
48—length of track 1
23—length of track 2
6B—length of track 3
Track 1 data masked (length 0x48)
252A343236362A2A2A2A2A2A2A2A393939395E42555348204A522F47454F52474520572E4D525E2
A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A3F2A
Track 2 data in hex masked (length 0x23)
3B343236362A2A2A2A2A2A2A2A393939393D2A2A2A2A2A2A2A2A2A2A2A2A2A2A2A3F2A
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