#desfire — Public Fediverse posts

#MIFARE #DESFire handles tens of applications within one card. How come #BEV charging stations service providers are still advertising, and charging for, their #RFiD plastic card shipped by #Post ?

Ah Ok, #hvv #prepaid Card nutzt #Mifare #DESFIRE Light #MF2DL100

Symmetric authentication is a pain as both sides have to know the key.

My door access has a key in the card reader which means inherently all cards have to have that key, else the reader has to know the key for each card, which does not scale.

The work around - encrypt the site key with the card UID and use that on the card. One key in reader, different key in each and every cards.

Compromising a card/fob is not easy, but this way it compromises only the one card, not whole site.

#DESFire

Symmetric authentication is a pain as both sides have to know the key.

My door access has a key in the card reader which means inherently all cards have to have that key, else the reader has to know the key for each card, which does not scale.

The work around - encrypt the site key with the card UID and use that on the card. One key in reader, different key in each and every cards.

Compromising a card/fob is not easy, but this way it compromises only the one card, not whole site.

#DESFire

@dysfun The #DESFire EV stuff is a big step forward, AES mode even more so. It is not perfect as reader has to have the keys - public key exchanges would be better, but it is so much better than #Mifare classic, or ultralight stuff.

@dysfun The #DESFire EV stuff is a big step forward, AES mode even more so. It is not perfect as reader has to have the keys - public key exchanges would be better, but it is so much better than #Mifare classic, or ultralight stuff.