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<p>[QUOTE=&quot;calcol, post: 12286087, member: 77639&quot;]Below are some links that give info on NFC/RFID security protocols.&nbsp;&nbsp; If you think about it, a chip that sends out the same info every time it is interrogated is easily cloned.&nbsp; Someone with a reader can capture the output, then program a new chip to send out the same info.&nbsp; There are lots of electronics engineers and techs who can do this.&nbsp; If the info came from a coin slab chip, the new chip could then be placed in a counterfeit coin slab. </p><p><br /></p><p>I don’t know the details of the algorithm(s)/encryption method(s) used in the chips put in PCGS slabs but would be shocked if the chips are simple send-out-the-same-info-every-time chips.</p><p><br /></p><p>Cal</p><p><br /></p><p><a href="https://security.stackexchange.com/questions/131638/how-can-rfid-nfc-tags-not-be-cloned-when-they-are-passive-technology" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://security.stackexchange.com/questions/131638/how-can-rfid-nfc-tags-not-be-cloned-when-they-are-passive-technology" rel="nofollow">https://security.stackexchange.com/questions/131638/how-can-rfid-nfc-tags-not-be-cloned-when-they-are-passive-technology</a></p><p><br /></p><p><a href="https://security.stackexchange.com/questions/63483/how-do-nfc-tags-prevent-copying" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://security.stackexchange.com/questions/63483/how-do-nfc-tags-prevent-copying" rel="nofollow">https://security.stackexchange.com/questions/63483/how-do-nfc-tags-prevent-copying</a></p><p><br /></p><p><a href="http://www.cs.fsu.edu/~burmeste/410.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.cs.fsu.edu/~burmeste/410.pdf" rel="nofollow">www.cs.fsu.edu/~burmeste/410.pdf</a>[/QUOTE]</p><p><br /></p>

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