HiTag2 RTLab 이재근

Contents Before Starting About HiTag2 Key Features Functionality Conclusion

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

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

Usage of HiTag2

Vehicle Immobilizer with HiTag2

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

Functionality

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

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

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

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

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

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

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