Show threadWuMing2Feb 20
My existing #DESFire EV1 card - I use for public transportation - is now registered also with one #BEV charging app. Will see if it works. May save carrying around one more piece of plastic and consumer electronics.
WuMing2Dec 15
#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 ?
PaulSep 8, 2025

I’ve been grappling with a #CoreNFC, #Swift, #CommonCrypto and #DESFire problem on and off for a few years. Not much help online due to being an intersection of multiple niches.

Decided to see if #LLMs could help.

No, they could not.

rena2019 ☑️Jul 18, 2023
Ah Ok, #hvv #prepaid Card nutzt #Mifare #DESFIRE Light #MF2DL100
Show threaduvokApr 25, 2023
Do you guys know any #android tooling which supports #DESfire EV2 'secure messaging', i.e. trying to authenticate with a custom AES key?
uvokApr 25, 2023

#programming #embedded

Trying to implement #desfire EV2 secure messaging.
I must have done something wrong, it doesn't work out somehow.

RevK Apr 9, 2023

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

RevK Dec 13, 2022
@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.
Show threadFrom: =?iso-8859-10?Q?=e6strid?=Nov 20, 2022

oh uh hashtags for search i guess, so this thread is findable.

#desfire #nfc #orcacard #smartcard