HT-CM400 NXP Semiconductors, HT-CM400 Datasheet - Page 97

• Manufacturer Part Number: HT-CM400
• Description: Ht Cm400; Ht Rm440 Family; Ht Rm800 Family Interface Protocol Reader - Host
• Manufacturer: NXP Semiconductors

98-02-10
5.3 Personalization of HITAG 1 Transponders
In order to be able to read data from the secret area of a transponder, you have to carry out a
procedure called authentication. To do this you need special data (keys).
After transmitting the according command the authentication is automatically carried out by the
read/write device.
5.3.1 Definition of Keys and Logdata
Keys are cryptographic codes, which determine data encryption during data transfer between
read/write device and transponder.
Two keys (Key A and Key B) which you can use independently of each other, have been installed
for security and flexibility reasons. The identity of either Key A or Key B on the read/write device
and on the transponder is sufficient.
Logdata represent "passwords" needed to gain access to secret areas on the transponder. A pair
of logdata is included with every cryptographic key (Key A and Key B). This logdata pair has to
be identical both on the transponder and the read/write device.
The keys and logdata are predefined by Philips Semiconductors by means of defined Transport
Keys (both keys show the same bit map) and Transport Logdata (all logdata show the same bit
map). They can be written to, which means that they can be changed.
ATTENTION: Keys and Logdata only can be changed if their current values are known!
It is important that the following values are in accordance with each other, i.e. the respective data
on the read/write device and on the transponder have to be identical pairs:
ad Key A:
ad Key B:
LOGDATA 0A
LOGDATA 1A
LOGDATA 0B
LOGDATA 1B
read/write
KEY A
KEY B
on the
device
Logdata 0 A
Logdata 1 A
Logdata 1 B
Logdata 0 B and
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Rev. 1.0
LOGDATA 0A
LOGDATA 1A
LOGDATA 0B
LOGDATA 1B
transponder
KEY A
KEY B
"Password" which the transponder sends to
the read/write device and which is verified
by the latter.
sends to the transponder and which is
checked for identity by the latter.
analogous to Key A
"Password"
on the
which
Set A
Set B
the
read/write
Personalization
Htswp.doc/HS
device