Advanced Card Systems Ltd. ACR3901T-W1, Reference Manual

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ACR3901T-W1 – Reference Manual
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6.1.6. Mutual Authentication and Encryption Protocol
In Bluetooth mode, the communication protocol will be encrypted and transmitted after a successful
mutual authentication.
Command Mode supported Sender Description
70h Connected Paired device SPH_to_RDR_ReqAuth
71h Connected Paired device SPH_to_RDR_AuthRsp
72h Authenticated Paired device SPH_to_RDR_DataReq
20h Connected Reader RDR_to_SPH_AuthRsp1
21h Connected Reader RDR_to_SPH_AuthRsp2
22h Authenticated Reader RDR_to_SPH_DataRsp
Table 10 : Summary of Mutual Authentication Commands
6.1.6.1. SPH_to_RDR_ReqAuth
This command will request the ACR3901T-W1 to perform authentication with the paired key-
generating device. After a successful authentication, the Customer Master Key can be modified by the
paired key-generating device.
For more information on the authentication process, please refer to Authentication .
Offset Field Size Value Description Encrypted
0 bMessageType 1 70h -
No
1 LEN1 LEN2 (wLength) 2 0100h
Number of extra bytes starting
from the next field for this
message, and is expressed in
two bytes long, and LEN1 is
LSB while LEN2 is MSB
3 wChecksum 1 71h
CSUM means the XOR values
of all bytes in the command
The response to this message is RDR_to_SPH_AuthRsp1 if the received command message is error
free.