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<p>[QUOTE=&quot;calcol, post: 4613382, member: 77639&quot;]No, there would not be just grade and cert. no.&nbsp; In fact those don&#039;t have to be there at all.&nbsp; There are a number of&nbsp; ways to do the security part.&nbsp; Here&#039;s one way:</p><p><br /></p><p>The chip would have a long, unique ID number embedded in it.&nbsp; Only PCGS would know it.&nbsp; It would also have a long encryption key, which only PCGS would know.&nbsp; When the chip receives a query signal, it generates a long random number which it combines with the ID number; then encrypts the pair.&nbsp; The encrypted pair is sent out.&nbsp; The PCGS server decrypts the pair and separates them.&nbsp; Then it checks the ID number against its database.&nbsp; It sends back &quot;invalid&quot; if that&#039;s the case.&nbsp; If valid, it sends back &quot;valid&quot; plus grade plus cert. no. and maybe a picture as well.&nbsp; Because of the random number, the encrypted pair will be different every time the chip is queried ... good luck to those who want to figure out the ID number.</p><p><br /></p><p>Privacy is not a real issue.&nbsp; Put the slabs behind metal (sheet or screen), and they&#039;re unreadable.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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