&gt; &gt; Garady<p>Thanks, typo fixed.<p>&gt; Asymmetric encryption<p>...doesn&#x27;t protect against everything. Not letting people hear the asymmetric encryption is even better.<p>&gt; special antenna<p>Cantennas are easy, and you should never underestimate the amount of technology people will throw at an attack. Consider, for example, the people that made ATM shims that captured the card data while recording the PIN being entered on the keypad.<p>&gt; &quot;defense in depth&quot;<p>Defense in depth would be using cryto <i>while</i> requiring a physical connection.<p>&gt; smartcard<p>A smartcard is fine - my argument is against RFID. A card that requires an electrical or inductive connection isn&#x27;t going to leak everything over the radio.<p>My suggestion of &quot;digital jewelry&quot; is merely an example of how the form of the smartcard is flexible. Creativity in this area could allow for some easier to use devices, which could be important in places like hospitals.