Protection by password
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_PasswordProtection
Configuring the transponder
with “Tag Config” facility
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_PasswordProtection
HEX
WriteWrite
and Read
protected
protected
zone zone
Remaining number of tries
(set by the transponder)
Alarm bit (set by the tag)
Not used
Number of tries
False login counter
Auto-select
Mask protected zone
Protected zone
Configuration word
100%
75%
50%
126
25%
126
HEX
False
Falselogin
logincounter
counterdeactivated
activated
Remaining number of tries
(set by the transponder)
Alarm bit (set by the tag)
Not used
Number of tries
False login counter
Auto-select
Mask protected zone
Protected zone
Configuration word
Configuration word - Summary
There are theoretically 160 possibilities of configuring the transponder
which can be brought back indeed to 90.
Protected zone
Deactivated
Activated
False login counter
Write
Write and Read
The number of erroneous tries is without influence
if the false login counter is deactivated
127
127 HEX
Password
Remaining
number of tries
Alarm bit
126 HEX
Number of tries
False login counter
Remaining number of tries
(set by the transponder)
Alarm bit (set by the tag)
Not used
Number of tries
False login counter
Auto-select
Mask protected zone
Protected zone
False login tries
126
1. Enter the number of the R/W
module
2. Each time data is entered
through "Transponder
Configuration", a login must
be made (here, it is assumed
that the tag is virgin:
password <0000>)
3. It is possible to modify the
size of the protected zone…
4. …to mask the zone means
to protect it not only against
writing but also against
reading
5. … to modify the number of
login trials
6. … to activate the counter of
false login
7. … to change the password
8. Pressing "Config Tag" writes
the Configuration word at
address 126 and Password
at address 127
Addresses 126 and 127
Not used
Managed
by the tag
126
127
Configuring the transponder
with specific commands
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_PasswordProtection
Reading configuration word
If the transponder is protected by a password, it is
mandatory to have logged in it first.
Data are expressed in HEX.
Writing configuration word
If the transponder is protected by a password, it is
mandatory to have logged in it first.
Data are expressed in HEX.
Changing the password
If the transponder is protected by a password, it is
mandatory to have logged in it first.
Data are expressed in HEX.
Memory of the transponder
Write and read protected zone (i. e. 50%)
Read zone
Result of reading in HEX without login
Protected zone
Result of reading in ASCII without login
Observe the protection codes
How to login?
000
060
063
064
071
50%
127
How to login?
Effect of login
Result of reading in ASCII with login
Observe the protection codes
000
060
063
064
071
50%
127
Protection
End ofby
this
password
chapter
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_PasswordProtection