[Cryptography] Cheap forensic recorder

[Emin Gün Sirer]

> 1) We make the hardware and seal it in some sort of tamper evident resin.
>

You can buy that today. Here's the specs for that chip seated in resin:
http://www.trustedcomputinggroup.org/resources/tpm_main_specification

2) We set up a notary log infrastructure. Let N(t) be the output at time t.
>

Someone did that, too. That someone is me:
http://virtual-notary.org


> 3) To notarize a document we first encrypt under key N(t) thus creating a
> document that nobody could predict how to decrypt when the device was made.
>

There are better ways, but this is fine.

4) We calculate hash values etc. over the encrypted data.
>

Ok.


> 5) We have two devices. The first takes the SD card and produces an
> encrypted image. This is then transferred to the second that calculates the
> hash value.
>

A TPM is a single device that can do both of these activities.


> 6) We then use the decrypted image as the master????
>

I guess one of your goals is to make sure to not read up on the state of
the art. This has been a very amusing thread. Best of luck with your
endeavor.
- egs
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