• 0 Posts
  • 17 Comments
Joined 2 years ago
cake
Cake day: June 13th, 2023

help-circle





  • Doesn’t this sort of bypass the whole point of encryption in the first place?

    No, homomorphic encryption allows a 3rd party to perform operations on encrypted data without decrypting it. The resulting answer is in encrypted form and can only be decrypted by whoever has the key.

    Extremely oversimplified example:

    Say you have a service that converts dollar amounts to euros using the latest exchange rate. You send the amount in dollars, it multiplies by the exchange rate and then returns the euro amount.

    Now, let’s assume the clients of this service do not want to disclose the amounts they are converting. What they could do is pick a large random number and multiply the amount by this number. The conversion service multiplies this by the exchange rate and returns the ridiculously large number back. Then you divide thet number by the random number you picked and you have converted dollars to euros without the service ever knowing the actual amount.

    Of course the reality is much more complicated than that but the idea is the same: you can perform operations on data in its encrypted form and now know what the data is nor the decrypted result of the operation.



  • A dolly zoom moves the camera, that’s the entire point of a dolly zoom. The zoom while moving the camera is only there to keep the framing the same, the actual visual change is caused by the movement of the camera, not by the changing of the focal length. You’d get the exact same effect if you used a fixed-focus lens and just cropped the resulting video to keep the framing constant.




  • That will get you a really shitty thermostat. Sure, even modern boilers can be controlled with a simple on/off signal but you really don’t want that, because it sucks. At the very least you need to make something that speaks OpenTherm. That allows you to modulate the boiler. With a simple on/off style thermostate you get relatively large temperature swings, with a modulating boiler/thermostat you can achieve very constant temperatures, which is way more comfortable, but requires both a more complicated protocol as well as more complicated logic.



  • BorgDrone@lemmy.onetomemes@lemmy.worldI'm afraid we've been bamboozled
    link
    fedilink
    arrow-up
    16
    arrow-down
    3
    ·
    edit-2
    3 months ago

    I do think that using the phase changes of water as the sole point of comparison is a bad argument.

    Why? Water is extremely important to life and very abundant. The phases changes of water are something that you are confronted with in every day life, all the time.

    For most people, the interaction with temperature is through the weather, and I don’t think Celsius is inherently better for that.

    I do, because the temperature being above or below freezing is a very important boundary. Freezing temperatures means slippery roads, frost on windows, car locks freezing shut, etc. A lot of our interaction with the world outside is affected by the temperature being below or above 0ºC. By comparison, 0ºF is completely arbitrary, nothing changes when you cross that boundary.

    I like that in Fahrenheit 0 is a cold winter’s day, and 100 is a hot summer’s day.

    10ºF is also a cold day, so is 20ºF and 30ºF. Just like 90ºF is also a hot summers day.

    I find that more relevant in day-to-day life than the phase changes of water.

    None of those seem relevant to me. I don’t need a round number to know that 37ºC is a hot day. There is no significance to 100ºF. 99ºF is also a hot day and so is 101ºF. Nothing interesting happens when you cross the 100ºF threshold.

    When you cross the 0ºC or 100ºC, potentially dangerous things start to happen of which you need to be aware.