4 ms·
Wouldn't you then be able to determine the fob ID by recording multiple car "random number" requests and fob responses?
by WiseWeasel 13y ago
Wouldn't you then be able to determine the fob ID by recording multiple car "random number" requests and fob responses?
- stcredzero 13y agoMake the nonce and the secret long enough, and you would have to break SHA512.
- lucb1e 13y agoI think that's part of how Mifare (NFC) was cracked; the entropy of the card's random number generator was very low. When implemented correctly it's a safe method though.