virtualization – Is Windows Sandbox a viable alternative to conventional VM solutions considering its design?

The idea of having a fast, disposable VM at the palm of my hand appeals to me very much. It makes adding an extra layer of security to any thing I want to do so easy – just launch the sandbox application in a matter of seconds and you’re done. Of course, that is considering the VM actually does the job it’s supposed to do…

A little disclaimer beforehand – I’ve read the article Beware the perils of Windows Sandbox at Magnitude8, describing how the Windows Sandbox comes with a NAT pre-enabled and thus any malware running on the guest would still get a direct access to your intranet, which is already a large problem. But for the purpose of this question, let us just consider the host-guest scenarios.

Windows Sandbox claims to “achieve a combination of security, density, and performance that isn’t available in traditional VMs”, by leveraging a different approach to memory and disk management. If I understand things correctly, everything that in theory can be safely shared between the host and the guest, gets shared. According to the official documentation, the Sandbox shares both the host’s immutable system files, as well as the physical memory pages.

Despite that, Microsoft seems to remain confident that their solution is secure as implied by one of bullet points mentioned in the Sandbox overview:

Secure: Uses hardware-based virtualization for kernel isolation. It relies on the Microsoft hypervisor to run a separate kernel that isolates Windows Sandbox from the host.

This obviously raises a lot of questions, because at the first glance, all this resource sharing should increase the attack surface greatly, leaving more space for exploits to be found. Also, even the most sophisticated technology, which changes only the implementation and not the design, does ultimately make the discovery of an exploit only more time and resource consuming, but not less possible, doesn’t it?

So, my question is

Would you consider Windows Sandbox to be a viable alternative to conventional VM solutions in terms of security, or do the shortcuts used to achieve the performance undermine the VM’s core principles too much? Or am I just not understanding the technology and all of what the Sandbox is doing is technically safe?

An extra question: Does the situation change when we’re talking about a web-based attack, such as opening a malicious site in a browser from within the Sandbox, or does it come down to the same situation as running an infected executable? (disregarding the extra layer of sandboxing done in the browser itself)

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Nikon F100 body – camera back latch repair solutions?

I have a Nikon F100 body that needs a back repair.

For those not in the know, Nikon abandoned its use of solid metal latches (that were highly durable) in favour of a lighter plastic latch. Over time, these latches or tabs weaken and can eventually break. Both of mine broke after having the camera in storage for a few years, so I think they just failed with age or else were about to fail when the camera was stored.

It is possible to buy used camera backs from a famous auction site or other sources, but they are likely to eventually fail as well.

I know that Nikon, at one time, did repair this fault but I am unsure if they used any upgraded parts. In any event, these parts are no longer available from Nikon.

What options are there to durably repair the back so that the camera will function again? I don’t want to use ugly options like duct tape – I want to be able to properly close the back again. I’d ideally like to find a solution that upgrades the strength of the latches so that they will last the remaining lifespan of the camera.

While I’m personally seeking repair shops or options that I can arrange to have done, I’m open to hearing suggestions that involve self-repair in order to make this question more useful in the archive.

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iphone – Are there solutions to block pornography on iOS and watchOS?

I need an effective solution for preventing my ability to see porn and immodest content on both my iPhone 11 Pro Max and iWatch 5 cellular.

Once that is accomplished:

  • I do want to otherwise retain maximum functionality on these devices.
  • Also this solution needs to have Some measure of uninstall protection

What software or service can help with this content blocking?

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number theory – Must a decision problem in $NP$ have a complement in $Co-NP$, if I can verify the solutions to in polynomial-time?

Goldbach’s Conjecture says every even integer $>$ $2$ can be expressed as the sum of two primes.

Let’s say $N$ is our input and its $10$. Which is an integer > 2 and is not odd.

Algorithm

1.Create list of numbers from $1,to~N$

2.Use prime-testing algorithm for creating a second list of prime numbers

3.Use my 2_sum solver that allows you to use primes twice that sum up to $N$

for j in range(list-of-primes)):
  if N-(list-of-primes(j)) in list-of-primes:
   print('yes')
   break

4.Verify solution efficently

if AKS-primality(N-(list-of-primes(j))):
    if AKS-primality(list-of-primes(j)):
        print('Solution is correct')

5.Output

yes 7 + 3
Solution is correct

Question

If the conjecture is true, then the answer will always be Yes. Does that mean it can’t be in $Co-NP$ because the answer is always Yes?