Specifications of the HT1 MOA3 S30

Rev. 1.1

1997-08-19

Ht1moa3.doc/HS

Page 17 of 24

5.4 Configuration of Delivered HITAG 1 Transponders

HITAG 1 transponders are delivered with the following configuration by Philips Semiconductors:

Unique Serial Number:

Serial Number:

Read Only

-

fixed

Configuration Byte 0:

Logdata:

‘1’ = r/w

-

can be changed

Key A, Key B:

‘1’ = wo

-

can be changed

Blocks 2 - 7:

‘1’ = r/w

-

can be changed

Configuration Byte 1:

OEM Lock Bit:

‘1’ = Configuration Page is r/w

-

can be changed

Blocks 4 - 7:

‘1’ = public

-

can be changed

Value for Transport Keys, Transport Logdata:

0x00000000

RECOMMENDATION:

Before delivering transponders to end users, the Configuration Page should be set to read only

(Configuration Byte 1/Bit 4 = ‘0’).

5.5 Definition of Keys and Logdata

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.

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.

ad Key A:

Logdata 0 A

"Password" which the transponder sends to

the read/write device and which is verified

by the latter.

Logdata 1 A

"Password"

which

the

read/write

device

sends

to

the

transponder

and

which

is

checked for identity by the latter.

ad Key B:

Logdata 0 B and

Logdata 1 B

analogous to Key A