HTRM440 Просмотр технического описания (PDF) - Philips Electronics

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HTRM440

HITAG proximity reader module hardware

Philips Electronics 

Philips Semiconductors

HITAG proximity reader module

hardware

Product specification

HTRM440 family

7.5.3 CHECKING USER DATA

This check is carried out on the HTRM440.

Security of the data read from the transponder by the

reader module remains with the user for reasons of

flexibility. Therefore, you can choose flexible check sums

and store them in the transponder memory together with

the data. You can protect sensitive data better than less

sensitive data, thus permitting optimized operation times.

7.5.4 DATA PRIVACY

The use of cryptography (stream cypher), mutual

authentication, and password verification prevents

monitoring and copying the data channel. Therefore, the

area of the transponder that only can be accessed

enciphered is called ‘secret area’.

To make use of cryptography for HITAG 1 transponders

you need:

• Keys to be used for initializing of the crypto block

• Logdata to be used for mutual authentication.

To make use of cryptography for HITAG 2 transponders

you need:

• A key which is used to initialize the crypto block using

HITAG 2 in crypto mode

• Passwords which are used for authentication for

HITAG 2 in password mode.

The transponders and the HTRM440 are provided with

identical transport keys and transport logdata so that you

can start operating them right away (see Table 1).

In order to offer our OEM clients high flexibility, the

configuration of the transponder memory, password, keys

and logdata can be changed. We strictly recommend to

rigorously restrict these possibilities for the end customers

(by setting the configuration page to read only, setting

password, keys and logdata to neither read nor write).

7.6 Operating security

The following mechanisms ensure the operating security

of the HITAG system:

• Anticollission mode

• Monitoring the supply voltage

• Detection of antenna rupture and antenna short-circuit.

7.6.1 ANTICOLLISION

In proximity reader applications using HITAG 1 or

HITAG 2 transponders, only one transponder is handled

even if there are several transponders within the

communication field of the antenna. In this case either no

communication takes place or the ‘stronger’ or closer

transponder takes over. By muting a selected transponder

(HALT mode) another transponder that is to be found in

the communication field of the antenna can be recognised.

7.6.2 MONITORING THE SUPPLY VOLTAGE

The supply voltage is controlled by a watchdog circuit

which triggers a system reset if the supply voltage drops

below 4.75 V or if the microcontroller fails.

7.6.3

DETECTION OF ANTENNA RUPTURE AND ANTENNA

SHORT-CIRCUIT

The HTRM440 does not get permanently damaged in case

of an antenna rupture or a brief antenna short-circuit.

Table 1 Transport values predefined by Philips.

SYSTEM

HITAG 1

HITAG 2

PARAMETER

keyinit password

keys

logdata

keyinit password

key

password TAG

password RWD

0x00000000

0x00000000

0x00000000

0x00000000

0x4D494B524F4E

0xAA4854

0x4D494B52

VALUE

2001 Oct 04

8

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