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So you could have you one unit with a unique serial or other address then you can register it with PP, or FTP or paypal, or your bank or whatever
[/ QUOTE ]If FTP or paypal can derive the fob's sequence from a serial number, so can the bad guys.
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Here is a link to the VeriSign sight, where you can do more research on how secure tokens work and some of the options available.
VeriSign Site
And here is a link to Wikipedia on secure tokens...
Wikipedia Secure Tokens
We want the "one time" or "single use" type for poker sites.