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Assuming the file was downloaded over http is this possible? I'm guessing there could be some way to do it using a hash and a timestamp however I'm not sure how you could prove nothing was tampered with including the downloaded file itself.

EDIT: As vonbrand suggested if the origin site provided a signed cert it would be a start. However, if the site doesn't provide any certs is there a clever way to loop in some third party?

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2 Answers 2

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Whatever you have on your machine, you can fake all day long. The file would have to come with some sort of independent proof, probably a signed certificate given by the origin website.

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  • Thanks. Unfortunately the origin site doesn't provide any certs. I'm wondering if there is some clever way to loop in a third party.
    – ajw0100
    Mar 23, 2013 at 20:34
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Do you of any tech savvy lawyers that can provide a suitable certificate?

Public notaries make excellent third parties.

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