Asking random ignorant stranger to care to protect themselves never works. We need solution that requires strictly zero effort. Best regards, Alex Kotenko 2014-05-19 14:06 GMT+01:00 Brooks Boyd : > >> 2014-05-18 13:14 GMT+01:00 Andreas Schildbach : > >> One problem we couldn't figure out here though - how to protect the > >> notes from unauthorized redeem. Like if someone else tries to reach your > >> wallet with his own NFC - how can we distinguish between deliberate > >> redeem by owner and fraudulent redeem by anybody else with custom built > >> long range NFC antenna? Any ideas? > >> > >> I think you'd need multiple factors to protect against that attack. Like > >> encrypting with a key that is printed on the note as an QR code. > > > >On Sun, May 18, 2014 at 7:51 AM, Alex Kotenko wrote: > > > > Yes, but it must not sacrifice usability. It's paper money, people are > used to it and they have rather high standard of expectations in this area. > Any usbility sacrifices in this area result into failure of the whole thing. > > > > Best regards, > > Alex Kotenko > > One thought I had reading through this exchange: I think the general > public is becoming more aware of the "hacker with a long range > antenna" sort of attack, since credit cards are getting microchips > that can be scanned. There's a few videos I've seen of white hat > hackers demonstrating how a suitcase-sized apparatus carried by > someone walking down the street can scan and make charges on cards in > people's pockets as the attacker brushes past. Hence RFID-blocking > sleeves/wallets are on the market, such that your smart credit card > can't make a purchase while its in your wallet. Is a RFID-blocking > wallet also NFC-blocking? Irregardless of whatever "future cash" you > choose to carry (be it credit card or bitcoin card/coin/cash), perhaps > its the wallet/purse that needs an upgrade, to ensure your money > doesn't spend itself while its in your pocket, but you can easily > remove it and spend it conveniently? > > Brooks > > > ------------------------------------------------------------------------------ > "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE > Instantly run your Selenium tests across 300+ browser/OS combos. > Get unparalleled scalability from the best Selenium testing platform > available > Simple to use. Nothing to install. Get started now for free." > http://p.sf.net/sfu/SauceLabs > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development >