• 2 Posts
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Joined 2 years ago
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Cake day: June 11th, 2023

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  • Terms like “safe” and “private” are not binary.

    Are the contents of your Signal conversations on an iPhone private with regard to mass surveillance conducted by governments and ISPs? Probably. Apple uses security and privacy as marketing points, and there are a whole lot of people looking for vulnerabilities in its products who are incentivized to disclose them (possibly with a delay for patches). Signal itself takes steps to prevent data leaks to less secure parts of the OS and other apps.

    Would your conversations remain private in the face of a targeted attack against your device by a nation state willing to spend a significant amount of time and money when you’re using Signal on an iPhone that’s presumably used for purposes other than secure conversations with a small set of people you know? Almost certainly not.


  • Zak@lemmy.worldtoAndroid@lemmy.worldRant about Google Play "Protect"
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    2 days ago

    If you don’t like it, turn it off.

    This would be a valid complaint if it was forced on you, but it isn’t. You can both ignore the warnings and disable the feature entirely.

    As to why it does that, it’s using heuristics based on the APIs the app calls and maybe a bit about how it calls them. If there are enough patterns similar to malicious apps, you get a warning.





  • I use Matrix, and I’ve moved some conversation with people I met in public rooms there to Signal because it kept failing to transfer keys rendering it unable to decrypt messages. I haven’t seen that in a while so maybe it’s fixed, but I haven’t been using it for one-to-one conversations lately.

    Unfortunately, I’ve found most people have a lot of resistance to adding another messaging app. I don’t really understand why that is, but it’s true. Asking someone to install a messaging app when I’m their only contact who uses it and they have another way to contact me has a success rate near zero.



  • Zak@lemmy.worldtoPrivacy@lemmy.mlJWZ weighs in on Signal again
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    10 days ago

    What is this? A Twitter post?

    Just about. JWZ is known for his cynical hot takes on tech in general.

    I don’t think any of his complaints are invalid, though his conclusions are uncharitable at best. Making a communication tool that’s both reasonably secure and sufficiently palatable to people who don’t know how to use computers to achieve broad adoption is a hard problem with no perfect solutions. If he has a better idea, well… he’s a skilled and somewhat famous programmer; he’s better equipped than most to implement it.




  • Well… sort of.

    Batteries perform differently under load. A battery that delivers 10Wh under a 1W load will probably deliver less (and get warmer) under a 10W load. Power supplies also perform differently under load, and DC-DC switching power supplies perform differently based on the output voltage. Generally, a larger voltage conversion and/or a higher load is less efficient. There’s also going to be some base power consumption in the circuit, so the most output power is probably achieved at some sort of medium load.

    To make things more fun, batteries are usually tested under constant current, not constant power. The increasing current as the battery drains of a constant power load will result in less total power, and constant output power often means increasing input power as the battery drains.

    In short, the real world is complicated. Giving best and worst case Watt-hours could be a reasonable approach.



  • Powerbanks are where it’s most problematic. They’re usually reporting the capacity of the battery cells in mAh. Those cells will be at 2.8-4.2V during operation, but the powerbank outputs 5V, or in modern powerbanks some higher number. 5000 mAh at the 3.6V average of the cells during discharge is certainly not 5000 mAh at the 9V it’s giving to my phone.

    It’s not going to give my phone 2000 mAh @ 9V or 18 Wh as the math would suggest either because it’s well below 100% efficient. I’m not sure what’s reasonable to demand in terms of advertising here since efficiency will vary with output voltage and output wattage.





  • There’s a significant distinction between servers that are actively malicious as you’re describing and servers that aren’t fully compatible with certain features, or that are simply buggy.

    Lemmy, for example modifies posts federated from other platforms to fit its format constraints. One of them is that a post from Mastodon with multiple images attached will only show one image on Lemmy. Mastodon does it too: inline images from a Lemmy post don’t show on vanilla Mastodon.

    I’ll note that Lemmy’s version numbers all start with 0. So do Piixelfed’s. That implies the software is unfinished and unstable.