&gt; Security is hard enough without adding in the possibility of 3rd parties hearing the protoocol<p>Asymmetric encryption is not that hard. In fact, you were using it while complaining about the problem it solves.<p>&gt; Garaday<p>Faraday.<p>&gt;  the ability to hear a transmmission often depends on the receiving antenna<p>So even if you somehow get past the asymmetric crypto you need RF expertise and a special antenna to mount the attack from more than a foot away? And not even a special antenna beyond a few miles? I&#x27;d call that &quot;defense in depth,&quot; not a flaw.<p>&gt; <a href="http:&#x2F;&#x2F;electronics.howstuffworks.com&#x2F;gadgets&#x2F;home&#x2F;digital-jewelry3.htm" rel="nofollow">http:&#x2F;&#x2F;electronics.howstuffworks.com&#x2F;gadgets&#x2F;home&#x2F;digital-je...</a><p>Just what do you think &quot;digital jewelry&quot; can do that a smartcard can&#x27;t?