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I am to release a design based on an Atheros SoC. I want to additionally secure the system. So I'm looking into adding a TPM to the motherboard's design, or using some USB/serial security token. I know very little about this topic. Where would I start?

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just to clarify are you designing a board or using an existing board? – Mike Naylor Feb 3 '14 at 15:13
Also, the Trusted Computing Group has a lot of good resources for understanding TPMs and also has a Developers resource section that may prove useful. – Mike Naylor Feb 3 '14 at 15:14
If the SoC supports it, you could also consider using a TrustZone based TPM. Depending on your scope/budget. – Scolytus Feb 4 '14 at 12:07
Have you looked at the wikipedia entry on this? – atom88 Oct 15 '15 at 18:49

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