Forum › MIFARE and NFC Reader IC`s › Secure commuincation speed Desfire Ev2 › Reply To: Secure commuincation speed Desfire Ev2
Hi Matej,
If you send plain data over a communication channel and the same data, but encrypted block by block before sending, then you will have a lower data rate, of course. Please do not forget, the MCU on the Smartcard is not the same you have in your laptop.
If you communicate with Smartcards via NFC, you must change the way you read and write files on a PC operation system. On a NFC communication, each read or write is costly, therefore you should only read the bytes you really want to know. On the one hand the bit clock is limited and on the other hand the buffer size is limited. Both can be lifted, but you must implement the selection of higher clock rate and the larger buffer size. The next point is, this could not be supported on a particular card or reader terminal.
The MIFARE DESFire allows it to read bytes with an offset and length parameter. If you need to know 8 bytes in file on a special offset, read the 8 bytes and then read the other bytes on a different position. My recommendation is to check which information do really want to know and try a more cleverer implementation of getting this data.
The TapLinx team
If you send plain data over a communication channel and the same data, but encrypted block by block before sending, then you will have a lower data rate, of course. Please do not forget, the MCU on the Smartcard is not the same you have in your laptop.
If you communicate with Smartcards via NFC, you must change the way you read and write files on a PC operation system. On a NFC communication, each read or write is costly, therefore you should only read the bytes you really want to know. On the one hand the bit clock is limited and on the other hand the buffer size is limited. Both can be lifted, but you must implement the selection of higher clock rate and the larger buffer size. The next point is, this could not be supported on a particular card or reader terminal.
The MIFARE DESFire allows it to read bytes with an offset and length parameter. If you need to know 8 bytes in file on a special offset, read the 8 bytes and then read the other bytes on a different position. My recommendation is to check which information do really want to know and try a more cleverer implementation of getting this data.
The TapLinx team
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