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2.0.   Fingerprint Scanner 

BioCARDKey is built around the TouchChip Silicon fingerprint sensor. It is a fast, reliable and 
inexpensive fingerprint peripheral, which can be used to authenticate users of computers and all kinds 
of information technology devices. 

The TouchChip device is suitable for applications such as desktop access control, network security, 
Internet-based applications and commercial verification and identification systems. It contains all the 
necessary biometric components: fingerprint sensing, image optimization and matching. Application 
Programming Interface (API) is also provided for easy integration into applications and to save a lot of 
development time.  (Please refer to Programmer’s Guide for more information on API.)  

TouchChip active capacitive sensing provides a much higher immunity to parasitic effects leading to a 
higher signal-to-noise ratio and the ability to capture a wider range of fingerprints than competing 
technologies, such as passive capacitive sensing. 

Typically there are two processes involved in a biometric application: 

1. Enrollment: 

 

Before the identity of an individual can be verified via his/her fingerprints, it is necessary to 
capture one or several fingerprint samples. This process is called enrollment. The samples 
are referred to as fingerprint templates and can be stored on a broad range of media such as 
computer storage devices or smart cards. 

2. Verification:

  

The verification process requires a user to verify his identity by placing his finger on the 
fingerprint scanner sensor. The live fingerprint is compared with a stored template using a 
matching algorithm in order to determine whether they represent the same set of fingerprints. 
The matching result is then made available to the computer. 

When using the fingerprint device, the security level is mainly governed by two parameters: 

1.  False Acceptance Rate (FAR):

  

FAR is the probability that a false sample matches with the original template previously 
extracted from the subject’s fingerprint images during enrollment. 

2.  False Rejection Rate (FRR):

  

FRR is the rate at which the system incorrectly rejects a legitimate attempt to verify.  

 

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AET60 Reference Manual 

Version 1.7  

 

Page 4 of 24

 

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www.acs.com.hk 

Summary of Contents for AET60 BioCARDKey

Page 1: ...AET60 BioCARDKey Reference Manual Subject to change without prior notice info acs com hk www acs com hk...

Page 2: ...se Length 255 bytes 11 6 2 2 No Transmission Error with Extended Response 12 6 2 3 Transmission Error 12 6 3 Reset Message 13 6 4 Card Status Message 13 6 5 Transmission Protocol 14 7 0 Smart Card Com...

Page 3: ...e that no one else can use their smart card should it become lost or stolen In the present state of the smart card industry different types of smart cards use different commands and different communic...

Page 4: ...biometric application 1 Enrollment Before the identity of an individual can be verified via his her fingerprints it is necessary to capture one or several fingerprint samples This process is called e...

Page 5: ...ecifications of ISO7816 3 with certain restrictions or enhancements to increase the practical functionality of the BioCARDKey 3 2 1 Smart Card Power Supply VCC C1 The current consumption of the insert...

Page 6: ...being removed As a general rule however to avoid any electrical damage a card should only be removed from the reader while it is powered down NOTE The BioCARDKey never does by itself switch on the pow...

Page 7: ...ed along with the device Status LEDs Red LED on the front of the reader indicate the activation status of the smart card interface Red LED Indicates power supply to the smart card is switched on i e t...

Page 8: ...upply for the reader 2 D Differential signal transmits data between BioCARDKey and PC 3 D Differential signal transmits data between BioCARDKey and PC 4 GND Reference voltage level for power supply NO...

Page 9: ...255 N 4 Header Instruction Data length N Data Checksum Header Always 01H to indicate the start of a command Instruction The instruction code of the command to be carried out by the BioCARDKey Data Len...

Page 10: ...the third byte represent data length N Data Data contents of the command For a READ command for example the data bytes would specify the start address and the number of bytes to be read For a WRITE c...

Page 11: ...lification of the command execution status A table listing the possible values of the status bytes SW1 and SW2 and the corresponding meaning is given in Appendix B Data Length Number of subsequent dat...

Page 12: ...a READ_DATA command for example the data bytes would contain the contents of the memory addresses read from the card The data bytes can represent values read from the card and or status information Ch...

Page 13: ...der to the computer are not desired they can be disabled with the SET_NOTIFICATION command Please note that the setting made with this command is volatile and will be lost with the next reader reset o...

Page 14: ...3 H 3 41H A The following example shows the transmission of a command with instruction code A2H and one data byte with the value 3DH The command has the following structure byte 1 2 3 4 5 Header Instr...

Page 15: ...INTERNAL MAX_C MAX_R C_TYPE C_SEL C_STAT INTERNAL 10 bytes data for internal use only MAX_C The maximum number of command data bytes MAX_R The maximum number of data bytes that can be requested to be...

Page 16: ...apt to slower host system speeds The time delay is given by N 0 1msec with N ranging from 0 255 00 FFH The default value is N 0 delay changes only valid on RS232 reader BAUD RATE Selects the baud rate...

Page 17: ...e RESET command only for the case when no card type is selected or when the card type 00H is selected For all other cases please refer to the specific section described for each individual card type C...

Page 18: ...Card Status Message Response data format No response data 7 1 6 SET_PPS_MODE This command selects the PPS mode to be used Command format Instruction Code Data length Data PPS_Mode 07 H 01 H NOTIFY Spe...

Page 19: ...length 80 H 00 H Response data format ATR ATR Answer To Reset as transmitted by the card according to ISO7816 3 NOTE The ATR is only returned in the BioCARDKey response if the communication protocol o...

Page 20: ...ata length Le 0 means no data is expected from the card NOTE With the T 0 communication protocol it is not possible to transmit data to the card and from the card in a single command response pair Hen...

Page 21: ...protocol Command format Instruction Code Data length Data LEN T1 BLOCK FRAME A1 H LEN Length of APDU command data N DATA T1 Block frame to be sent to the card Response data format BYTE 1 BYTE N BYTE x...

Page 22: ...the GET_ACR_STAT command correspond with the respective card types Cyber mouse Card Type Code Card Type 00H Auto select T 0 or T 1 communication protocol 0CH MCU based cards with T 0 communication pro...

Page 23: ...60 04 Card not powered up This status code is also returned in a response if the card was temporarily removed during a card access 60 05 Invalid Instruction Code 60 20 Card failure 60 22 Short circui...

Page 24: ...t is also recommended that before each touch the sensor be cleaned as described in section D 3 Appendix C 2 Periodic Cleaning Dampen a lint free cloth or cotton swab with alcohol or acetone Gently rub...

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