sad treacherous computing day
simo.sorce at xsec.it
Mon May 7 15:08:56 UTC 2007
On Mon, 2007-05-07 at 16:28 +0200, Alfred M. Szmidt wrote:
> On Mon, 2007-05-07 at 15:52 +0200, Alfred M. Szmidt wrote:
> > This is the exact case I stated, prohibiting others from updating
> > their software. It is one thing to _verify_ the binary, and still
> > allow it to run, and another to simply say `You're bad! Go away bad
> > person!'; and this is exactly what DRM/TC does. Signing binaries is a
> > great way to check their integrity, but that doesn't mean that one
> > shouldn't be able to run unverifiable binaries. So I still don't see
> > how DRM/TC can be a useful thing.
> Let's try to make it clear. I don't want Alfred Szmidt to be able
> to get access to my machine and take it over by installing his
> malicious kernel or any of his malicious binaries. I, myself,
> under my personal control, do you get it?
> This example has nothing to do with TC or DRM. This is how just about
> any modern operating system works. I cannot update the kernel on this
> machine since I do not have the permission to do so because the kernel
> disallows me to do that task, but there is no need for a specially
> crippled chip for this task. So I still do not see the use of DRM/TC.
It is an additional measure that can help you in case of bugs. If I have
a vulnerability, in a service, that let you get root privileges on a
machine, I can still prevent you from changing vital components because
of the hardware protection. A reboot will make sure my machine is not
compromised because I know you were not able to change vital system
components like the kernel as you don't have the signing key I keep
> You are confusing two things, hardware and software. TC is purley
> hardware based, and TC with DRM is even more evil.
Please document yourself a bit before going on.
As I said before it's the use you make of a technology that is good or
bad, and I agree that using TC/DRM against a user is bad. But this does
not make a Fritz chip bad per se.
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