2 ms·
Non trivial amount of RFID access cards work the wrong way around, ie. the reader authenticates to the card.
by dfox 2y ago
Non trivial amount of RFID access cards work the wrong way around, ie. the reader authenticates to the card.
- lxgr 2y agoThese systems usually do mutual authentication, and that's as much a side effect of the cryptographic primitives used as it is an intentional feature: They're often using symmetric cryptography (even ECC is orders of magnitude more complex than a simple block cipher), and you get mutual authentication "for free" that way, in exchange for having to guard the keys on both the card and the reader to prevent a total compromise.