Bourgogne ET Grasset SAS VEGRDE2 Manuel D’Utilisation

27-07-2002 

 

Vegas Long Range Read/Write Device  

Page 47 (48) 

Confidentiality Level 1 

           

Vegrde3/EG 

Bourgogne et Grasset  -– ZI Beaune Savigny  -– 21200 Beaune  –  France  –  Tel. +33 380 26 26 26  –  Fax. +33 3 80 26 26 00 

 

 

To change logdata use the same procedure as described for changing keys. Be careful to change 
them by pairs (on the HITAG VEGAS read/write device and on the data carrier): 
 
1.  Change, for example, Logdata 0A on the data carrier (by overwriting page 5). 
2.  Change Logdata 0A on the read/write device to the new value. 
3.  Change Logdata 1A on the data carrier (by overwriting page 6). 
4.  Change Logdata 1A on the read/write device to the new value. 
 

 
When you change a key, this does not mean that you also have to change the corresponding 
logdata and the other way round.  
 

 
All the data necessary for the authentication of the data carrier and the 

 

read/write device as well as the data needed for encryption can be protected in the 

 read/write device both from being read and being written using special serial 

commands. 
 
This mechanism consists of several levels: 
 
Level 0:  All security relevant data can be read and written. However, to write these data you 

have to enter the old data as well. You can read the old data before you start. 

 
Level 1:  The data cannot be read any more. If you want to change an entry, you have to know 

the old value. Otherwise writing access will be denied. 

 
Level 2:  The internal data can neither be read nor written. At this level it is impossible for the 

user to change the stored data. 

 
 
The following data are subject to the mechanism described above: 
 
### 

Key information A, B 

### 

Logdata 0A, 0B 

### 

Logdata 1A, 1B 

 
You can assign one of the levels mentioned above to each part of information in this list. 
 
You cannot reset levels, e.g. from Level 2 to Level 1. Once a security level has been chosen 
it becomes irreversible.