1. HiTag2
RTLab 이재근

2. Contents Before Starting About HiTag2 Key Features Functionality
Conclusion

3. Before Starting
Immobilizer - electronic device fitted to an automobile which prevents the engine from running unless the correct key is present.
Passive RFID Tag (125kHz)
Introduced in the ‘90s
Prevents hot-wiring
Mandatory

4. HiTag2 –NXP Semiconductors
HITAG is low-frequency (LF) RFID Tag.
harsh environment applications, where highly reliabile, robust and safe data transmission is required.
Livestock tracking, Gas cylinder logistics, Factory Automation, Loyalty cards, Vehicle Immobilizer transponder

5. Usage of HiTag2

7. Vehicle Immobilizer with HiTag2

9. Key Features NXP Semiconductors – 1996 Operating at 125kHz
Proximity(20cm) and long range(1m)
Non-volatile memory(EEPROM) of 256bits. (8page, 4bytes)
Long-term proven and reliable technology (10 years non-volatile)
Two coding schemes for read – Biphase, Manchester
Mutual authentication function
Stream cipher with 48-bit key

10. Functionality

11. 3 operation mode Public mode Password mode Crypto mode
contents of the user data pages are simply broadcast by the transponder
Password mode
reader and transponder password authentication
Crypto mode
mutual authentication of reader and transponder by means of a 48-bit shared key, encrypted using a proprietary stream cipher.
Used in car Immobilizer transponder

12. Memory Map 256bits of non-volatile memory(EEPROM)
Organized in 8 blocks of 4 bytes each

13. Command State – halted, active n0~n2 -> Block register
Command with redundancy
The number of msg -> 10+5r bits

14. Scenario Challenge – Response (Reader – Transponder)
Using stream cipher
Reader sends command to transponder and then transponder responds.
After finish authentication, It starts engine.

15. Hitag2 stream cipher
In crypto mode, the communication is encrypted with HiTag2 stream cipher
48-bit LFSR(Linear feedback shift register)
Non-linear filter function f

16. Conclusion Low consumption, highly reliabile, more secure
Suitable for automobile Immobilizer

17. Thank you