smartcard - How to change master key of DESfire cards?What is deciphered key? -


i want change master key of desfire card. read mifare desfire datasheet already, new in field, couldn't understand it.

it explained how change key @ page 37 of above document.

can give me example or step step tutorial changing keys? (including associated apdu commands)

what deciphered key mentioned in document? shall decipher new key , use in command? if so, how decipher key data?

your decipheredkey cbc-mode decrypted value of new key 0 initial vector.

this mifare desfire feature: terminal always decrypts (even hide plaintext!) , desfire card always encrypts. based on fact, decryption , encryption using symmetric ciphers des, 3des or aes inverse functions, can both used both hiding , revealing plaintext.

it helps improve performance - desfire card not have switch cipher mode encryption decryption each apdu.

see page 12 of document.


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