IDTECH SecureHead User Manual page 37

4.1.27. Get Challenge
Host gets 8 bytes random number from SecureHead in order to do external authentication.
Command
01 00 03 00 00 04
Command Response
01 00 0A 01 00 <8 bytes of Challenge Data>
4.1.28. External Authenticate
SecureHead will use this command to authenticate the host by comparing the decrypted data from the
host with its random data.
Command Format:
01 00 06 00 05 <First four bytes of decrypted random data from Get Challenge>
Command Response
01 00 02 01 00
01 00 02 01 01
4.1.29.
Load Security Key
The sixteen bytes key is used encryption, and its default value is 0000 0000 0000 0000 0000 0000
0000 0000.
For security purpose, key injection only allowed after successful external authentication, and will be
loaded by two components each with 16 bytes of key.
Those two components will be XORed to generate key for encryption.
Command Format
01 00 13 00 04 01 <16 bytes of First Key Component>
01 00 13 00 04 02 <16 bytes of Second Key Component>
Command Response
01 00 02 01 00
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SecureHead SPI Interface with FPC User Manual
Success
Fail
Page 37 of 67