Forum › MIFARE general topics and applications › Mifare authentication string › Reply To: Mifare authentication string
Hi,
Authenticating with MIFARE Classic is a process comprised by three stages.
1. You should SELECT the Card in RF field from the reader
2. AUTHENTICATING TO A SECTOR (16 in a 1K MIFARE Classic Card) with a properly key (The so called "transport key" by default, is 0xff ff ff ff ff ff -six bytes long-)
3. READING AND/OR WRITING FROM/TO A REGISTER of 16 Bytes (3 effective register for data by sector, except the sector 0, which has 2 effective records, because the firs one is a read only Manufacturer Block; and one sector trailer record, in which the secrets key and the sector access conditions bits resides).
NOTE1: The authentication process should be done every time you need change from one sector to another.
NOTE2: The select process should be done every time the authentication process fails.
NOTE3: Each reader has its own command syntax.
To write an interfase you should have acces: to the reader commands protocol, to the command set of the reader, and of course, the datasheet of the Card. (A good staring point is the MF1 IC S50 Functional specifications).
Regards,
Claudio
Authenticating with MIFARE Classic is a process comprised by three stages.
1. You should SELECT the Card in RF field from the reader
2. AUTHENTICATING TO A SECTOR (16 in a 1K MIFARE Classic Card) with a properly key (The so called "transport key" by default, is 0xff ff ff ff ff ff -six bytes long-)
3. READING AND/OR WRITING FROM/TO A REGISTER of 16 Bytes (3 effective register for data by sector, except the sector 0, which has 2 effective records, because the firs one is a read only Manufacturer Block; and one sector trailer record, in which the secrets key and the sector access conditions bits resides).
NOTE1: The authentication process should be done every time you need change from one sector to another.
NOTE2: The select process should be done every time the authentication process fails.
NOTE3: Each reader has its own command syntax.
To write an interfase you should have acces: to the reader commands protocol, to the command set of the reader, and of course, the datasheet of the Card. (A good staring point is the MF1 IC S50 Functional specifications).
Regards,
Claudio
+ 0
|
- 0