Re: [PATCH] Delete cryptoloop

Matt Mackall
2004-07-27T08:53:14Z

On Tue, Jul 27, 2004 at 01:40:47AM -0700, Junio C Hamano wrote:
> >>>>> "MM" == Matt Mackall <mpm@selenic.com> writes:
>
> MM> Here's a scenario: corrupt government agency secretly watermarks
> MM> incriminating documents. Brave whistleblower puts them on his laptop's
> MM> cryptoloop fs, but gets taken aside by customs agents on his way out
> MM> of the country. Agents check his disk for evidence of the watermark
> MM> and find enough evidence...
>
> Jari's exploit uses the property that his watermarks are
> encrypted to identical ciphertext blocks, but does it mean that
> the technique can be used to prove that identical ciphertext are
> from the watermarks and not coming from mere coincidence?

Probably. Or maybe just enough evidence to pull out the electrodes or
equivalent.

--
Mathematics is the supreme nostalgia of our time.