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<p>[QUOTE=&quot;calcol, post: 12275040, member: 77639&quot;]The chip used on PCGS holders uses NFC (near field communication), which is an inductive field communication similar to wireless battery charging.&nbsp; All PCGS holders issued today have it … you get it whether you want it or not.&nbsp; The chip gets its power from the reader, so no onboard battery is needed.</p><p><br /></p><p>The chip does not just send a single, predetermined code each time it’s interrogated.&nbsp; That would not be secure because someone could read the code and program another chip to send the same signal.&nbsp; Instead when the chip is queried it sends its ID code plus an additional code that is generated with an algorithm known only to a valid interrogator (like PCGS).&nbsp; So why not intercept this code and program a chip to send it too?&nbsp; Won’t work because the algorithm changes the code each time when a genuine chip is interrogated.&nbsp; The algorithm is known to a valid interrogator though, and it can verify that a valid or invalid code was sent.&nbsp; The previously sent code is considered invalid by a valid interrogator, which is why sending it again won’t work.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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