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/tech/ - Technology

"Technology reveals the active relation of man to nature"
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File: 1629835954771.jpeg (19.3 KB, 600x343, bicycle-kinetic-energy-re….jpeg)

 No.10754[Reply]

Flywheels are cool as heck, you can use them to store electric power or even mechanical energy from other spinning devices through kinetic energy recovery systems. It seems like this would save a ton on gas mileage, why aren't these found in more automobiles?
11 posts omitted. Click reply to view.
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 No.10782

>>10781
>So, why didn't Japanese car makers include flywheels?
Because they cost more than they save?
>[_] Miracle technology everybody is too dumb to use
>[X] You don't have all the facts and there is a catch somewhere
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 No.10783

>>10782
hey i was just asking a honest question

>Because they cost more than they save?

No that can't be it, there were short range buses that were powered by flywheels, which essentially used them like batteries. For a car to recover breaking energy you'd need a tiny fraction of the capacity.

there has to be something else that prevents their use that is not so obvious. Like maybe gyroscopic properties that made the car handling weird or something.
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 No.10784

>>10783
>there were short range buses that were powered by flywheels
Ok. There are also cars that run on wood. Just because it's possible doesn't mean it's a good idea.

It's worth noting that many electric cars and hybrids have regenerative braking. You just reverse the motors and turn them into generators while braking. Then you get a nice boost of energy when you accelerate after the corner. The Porsche 918 was famous for being one of the first road cars to do that. The mechanical flywheel thing doesn't seem that useful though.

There's a bit of history about Formula 1 trying to use flywheels here
https://en.wikipedia.org/wiki/Regenerative_brake#Use_in_motor_sport
My interpretation is they are only really useful for countering turbo lag in racing and even then it was not really worth the extra weight and complexity.

And like I say, if there was any fuel efficiency gains to be had then Japan at least has more than enough ingenuity and motivation to make it work.

>hey i was just asking a honest question

*baka**
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 No.10785

>>10784
>It's worth noting that many electric cars and hybrids have regenerative braking. You just reverse the motors and turn them into generators while braking. Then you get a nice boost of energy.
Batteries can't handle enough current, they can only capture between 10% and 25% of braking energy. Electric super capacitors should be able to capture enough energy for stop and go regenerative braking. However Flywheels can handle truly enormous power spikes at high efficiency in a very compact size, this tech will probably make a comeback.
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 No.10786

>>10783
>Like maybe gyroscopic properties that made the car handling weird or something.
That actually is a problem and why flywheels are more common on vehicles that don't turn a lot. You need a flywheel mounted in gimbals to be able to overcome its inertia and make large directional changes when storing really large amounts of energy.


 No.10773[Reply]

Is anybody willing to speculate whether the mega drive reaction-less space drive pans out ?

here is another video
https://www.youtube.com/watch?v=0bp8fk5rosI

the theory part might be plausible
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 No.10774

impossible
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 No.10779

No they don't. There is no explanation for their physics and the peddlers just claim that they will magically work if they were just tested in space; something rather expensive and infeasible without justification through proper scientific methods.

They also seem to have found believers among the conspiracy theorists on /pol/ and other places who are convinced that jew physicists don't want them tested in space because jew physics is smoke and mirrors holding whitoids back from being the pioneers in space exploration.


File: 1630074799367.jpg (125.15 KB, 1240x840, tumblr_mwbirxCG5Q1rso91mo1….jpg)

 No.10763[Reply]

ITT post a tool or tools you find useful when attacking, maintaining access, bug hunting, recon or whatever else. I'll start:

Weevely3 is my favourite out of the box PHP/.htaccess web shell. Its payload is very small and you can sneak it in to many places and has many features that make the job faster, especially with its pivoting functionality
and lastly its modular allowing easy creation and sharing of new functionality such as adding privilege escalation methods and automated further backdoor and persistent access creation.
https://github.com/epinna/weevely3


File: 1627879257222.jpeg (53.65 KB, 1200x630, javascript.jpeg)

 No.10548[Reply]

This guy wrote an interesting article on using popular sites with javascript disabled:

https://www.smashingmagazine.com/2018/05/using-the-web-with-javascript-turned-off/

His experience was that news sites/blogs tended to "mostly" work while most other sites were utterly broken.

WHAT IS /TECH/'S OPINION ON JAVASCRIPT?

I know many on the channers totally disable js in the browser since Stallman wrote an article against javascript many years ago, additionally many are paranoid about browser zero days used by glow in the darks. Finally a ton of people just see javascript heavy sites as being bloated and overengineered, having slow load times and discriminating against minimalism and third world users with slower internet.

With more and more sites using SPA frameworks like vue, react, and angular, and less and less apps doing server side HTML rendering, javascript-disablers are quickly becoming a tiny minority.

What do we think about js vs nojs/noscript?
44 posts and 2 image replies omitted. Click reply to view.
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 No.10733

>>10730
>Why should the site have tracking functionality included, when it needs to load that from a tracking provider?
Consider a "4th-party" or "meta" tracker specialized in fingerprinting users through their adblocking filters. Yes, eventually this tracker would also be end up in blocking filters, but that's how it is, cat and mouse game.
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 No.10734

>>10733
That was a technical question. How could the site access tracking infrastructure, when it would need to hardcode it into every page and could not forward the data to the tracking provider over js/ajax.
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 No.10735

>>10734
The example I gave is of a not-yet-blocked provider, a new kid on the block, but yes, they technically could also hardcode it into every page, although why not just make the 1st party host the script file? The script just needs to send the raw data back to the website itself (so 1st party request), then their backend forwards the data to the provider to be analyzed. It's not that hard technically, the website just installs a server module that does all this automatically.

Maybe you're thinking why does this matter when filters will catch up sooner or later (although remember that the fingerprinting threat comes from users using different filters). It matters in the case of Tor browser due to how it defeats fingerprinting: it doesn't block trackers, it gives them fake data that is uniform for all Tor users or otherwise ensures uniform conditions (e.g. window size), so that everybody looks like the same person. But when you block a specific selection of those trackers instead, you introduce new bits of fingerprint data with that selection.

It's two different methods that right now kinda step on each other's toes in practice, and one (block filters) is always catching up with the million trackers out there, while the other (Tor browser) just has to keep the browser's mouth shut / feed the lines to it in a uniform and consistent way.

That doesn't mean they can't work well together. For example, there's things that Tor devs haven't discovered how to spoof yet without fundamentally breaking things. One such example is the scroll bar width, it can be calculated via window and viewport size difference. For such cases blocking trackers would be useful, but the only proper solution is for Tor browser to be bundled with adblocker by default without user being able to switch it off or change filter lists, so that uniformity is enforced. Unfortunately that doesn't look likely:
>>10731
>>10732
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 No.10737

>>10731
>Adblocking bundled with the browser would mean that the browser itself and not merely the user is antagonistic to various interests that make money from ads and trackers (websites themselves, ad networks, data brokers…). Just one concrete consequence of this is more websites would then block Tor users in return (there are other more complex things as well), but the project in general would be antagonistic to capital's interests, thus potentially losing some of its support, both financial and in terms of technical "tolerance" (cf. the war between Tor and Cloudflare).
Great point.
>>10730
>I don't think the added attack surface you get from allowing all js is worth the risk of fingerprinting.

Browse in Whonix then. A tor dev (Matt Traudt) says this about JS exploits:
<setting the security slider to its highest setting:
>This is unnecessary for the majority of adversary models and will make the web significantly less usable.

>The only people who have had significant JavaScript exploits used against them in Tor Browser were pedophiles using Windows. This suggests to me (and security experts in general, AKA not people that read "tech news" and parrot everything they read) that these exploits are rare, expensive, and hard to replace. Thus they aren't going to be used against random people because the risk of the exploit being discovered and fixed is too great.


>Setting the security slider to its highest setting does remove JavaScript as a possible attack vector. So as long as you set it there consciously, are aware much of the web may break, I support your choice to disable it. I especially support it if you have legitimate concerns that JavaScript exploits may be used against you, not just dumb paranoia.

http://tv54samlti22655ohq3oaswm64cwf7ulp6wzkjcvdla2hagqcu7uokid.onion/posts/about-to-use-SkxEFK1m/#index2h1

I use 'safer' in whonix but if 90% of tor users used 'standard' (which I Post too long. Click here to view the full text.
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 No.10744

>>10737
Whonix is really the ultimate solution if you still want to use a normal OS instead of Tails or Qubes. And if you still want to run Tor browser natively on host OS then there's firejail which runs the browser in a sandbox.

>I use 'safer' in whonix but if 90% of tor users used 'standard' (which I think is unlikely?) then I would switch to that

Idk, I think a huge majority of users are allergic to sacrificing any usability, so it might be close to 90%. But a lot of them also do stupid shit that makes them less uniform. When letterboxing was introduced you had a mass of people complaining on Tor's blog about "grey borders", meaning they were all resizing and maximizing their windows prior to that. It really showed how uniformity is really poorly maintained by users in practice, which fucks it up for everybody.

Btw, on fingerprint tests I get best results at "safest" security level, while "standard" and "safer" come out exactly the same. Although I doubt these tests are that good. EFF's one claims to test with real trackers yet I get same results even with or without uBlock Origin with all filter lists enabled.

Should be mentioned though that security levels are not meant to defeat fingerprinting but reduce browser's security vulnerabilities.


File: 1625128444089.png (98.49 KB, 1200x1200, fediverse.png)

 No.9688[Reply]

hi /tech/ , have you seen the federated chans that are coming along?

https://fchan.xyz is 4chan + ActivityPub. It's a bit rough around the edges, but it's going to be able to connect to other ActivityPub projects like Lemmy and Mastodon later.

https://0chan.vip is a tag-based textboard that will soon gain a scraper. It also has user-managed boards with stickies, permasage, and a "soft delete" that hides threads in board view, but doesn't delete them from the server. see http://0chan.vip/b/meta/

NNTPchan was kind of cool but it was pretty busted. It fizzled out after a year.
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 No.9690

File: 1625130399158.png (19.11 KB, 600x200, cloudflare.png)

I spent a fair bit of time trying to understand NNTPchan when 8ch was shut down because I see decentralized federation as the only real way to fight back against the CDN-DDoS racket and resist censorship. It was disappointing to me when so many diaspora communities went and decided to just clone the old traditional image board site model all over again without seeking to address how they lost their community in the first place. It was even more disappointing to find out how unpopular NNTPchan was.
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 No.9691

>>9690
>because I see decentralized federation as the only real way
if you want that than make a general decentralization layer protocol, that everybody can use to build on top, add something to the general purpose network stack, instead of making specialized applications.
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 No.10741

Might as well bump this too
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 No.10742

The two sites ought to develop and adopt an fchan fork and then follow each other. But of course they never would because the ability for users to move to another server without creating an isolated community would directly threaten janny privilege.
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 No.10743

what happened to 0chan.vip?


File: 1624224280351.png (198.34 KB, 512x337, hacker.png)

 No.9486[Reply]

Please dump any resource I can use to teach myself, including online communities I can join for questions.

Is Python optimal?

Thanks in advance
12 posts omitted. Click reply to view.
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 No.10416

>>

 No.10425

https://wikileaks.org/vault7/
Off topic this is, but somewhat relevant.
So some of these are targeted at Linux.
Is this a problem.
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 No.10436

>>10416
Interesting. Thank you.
>>

 No.10736

https://blog.0xffff.info/
This blog really cant be overstated in its quantity of quality work.
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 No.10738

bumping this epic bread.


File: 1628763320531.jpg (27.27 KB, 479x361, getinhere-debian.jpg)

 No.10673[Reply]

4 posts and 1 image reply omitted. Click reply to view.
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 No.10701

File: 1628946103856.png (31.52 KB, 1392x714, upgrade.png)

upgrading my server RIGHT NAO
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 No.10706

>>10696
Debian really is the worst distro for KDE. KDE has a rapid pace of 3 releases per year. You're going to be stuck with 5.20 and KDE window manager had major rework in 5.21 and is being massively pumped by valve right now. And many new improvements are coming soon with 5.23
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 No.10707

>>10706
Well, same goes for a lot of other packages in general, on Ubuntu LTS as well. If you really need some patch or a feature then you have to edit and compile that package yourself, which is not always possible due to dependencies. But sometimes it's just a case of maintainers compiling packages without some shockingly basic flag - like libcurl without brotli support (now commonly used by servers to compress web pages, so you need it to decompress). The good side is that packages are rarely updated so you don't have to do this regularly, but it's still a pain in the ass.

Debian Testing is actually pretty stable itself though, but the drawback is that security patches are not backported like they are to Stable, so you have to wait until they're transferred from Sid the regular way. If something else blocks that package from arriving at Testing then your system is left vulnerable. So now you have to follow their security announcements and patch things yourself if it's something serious. Also pain in the ass.
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 No.10726

>>10706
>What are backports
>What is testing
How do people still not know about this
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 No.10727

How stable is KDE wayland at this point? I remember reading there were still some problems with "plasma-wayland" ~half a year ago.


 No.1280[Reply][Last 50 Posts]

Thread for questions that don't deserve their own thread.
I wanna buy some headphones to go outside i don't want to spend more than 100€ on them. I want them to be mostly durable and secondly to have good sound quality, also i don't want to look like a jackass while wearing them, any suggestions?
134 posts and 15 image replies omitted. Click reply to view.
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 No.10033

>>10019
'Good' is literally subjective, and while I'm a FOSS programmer, that's not a necessary factor.
Maybe start with being extremely correct, maintainable and extendable, user controllable (e.g. FOSS) and non-exploitative (no ads, no telemetry or opt-in).
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 No.10035

>>10019
Good software is an expression of your gattungswesen.
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 No.10705

Hello, new to Linux and I would like to know if there is a PDF reader with the following characteristics:

1 - Has a "Fit content" option for zooming
2 - Remembers the last page I visited

Even if not the second option, the first is essential to me, my speed in reading PDFs has decreased a lot since I have to manually scroll down to read the content in each page instead of just using the keyboard arrows.
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 No.10721

File: 1629103741059.gz (787.42 KB, xpdf.tar.gz)

>>10705
Try xpdf v3.04
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 No.10722

File: 1629103789315.png (114.84 KB, 1281x1024, xpdf.png)



File: 1619377509123.jpg (118.58 KB, 700x700, 4540b074107d531f234c09f3f8….jpg)

 No.8091[Reply]

What are some good, lightweight and regularly updated music players I can download?
7 posts and 1 image reply omitted. Click reply to view.
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 No.8105

I just use mpv.
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 No.8163

I still use audacious because it has a very clean and simple old school interface that can be customized and cleaned up further. Everything else I find too cluttered or/and lacking.
I only play local files, but maybe it supports more advanced shit, I don't know.
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 No.10710

File: 1629033323831.png (46.31 KB, 913x509, 2021-08-15_14-14.png)

>>8091
cmus. nothing else needed
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 No.10711

>>8163
Audacious also supports http, proxies and most winamp skins. A selectio of plugins plugins is maintained alongside it and you may even get XMMS plugins to compile against it.
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 No.10718

>regularly updated
It plays music. What's there to update?


File: 1629052907973.jpg (35.44 KB, 467x354, steamboy.jpg)

 No.10712[Reply]

A short while ago Valve announced and demoed a functional gaming handheld, that uses a AMD labtop CPU with a very powerfull iGPU and a beefed up memory-bus for about 500 money.

The big wow was that it was running Arch Linux as operating system under the hood, with access to a desktop mode, that would actually be usable as a PC. Most of the people (including me) in the Free Software and Linux scene were excited about this because it means more people using Linux and maybe better driver support.

I have only ever used steam once and i managed to buy a game and then somehow invalidate my license key or user account that was attached to it. I'm pretty sure this was user-error, but still i felt like i was being punished for legally buying a game. I kinda gave up on gaming, although i do sometimes still follow technical news about video game engines.

My experience with DRM systems in general is that it's a fickle bitch and proprietary software doesn't just mean that it's violating the 4 User Freedoms bequeathed to us by Saint Stalllman, it also means that it's probably going to stop working at some point. At least in my case I managed to wrench quite a number of DRMed programs i payed for. I basically think that Intellectual property enforcement is some kind of political, ideological or religious terror, that can only be explained by an unreasonable amount of evilness. I know this sounds a little silly but consider that it feels like unpredictable unexplainable punishment when drm wigs out. Stallman really can feel like a angel descending from the sky telling you a transcendental truth. (Figuratively speaking)

And here is where my doubts come about, steam uses DRM for most of it's games, and Linux users in general really don't like DRM, or proprietary software, and there might be a lot of friction, about it. However I don't think Valve will switch to windows, because Microsoft has it's own videogame-store on windows as well as their own console that is the arch nemesis of Valve and steam. Their dependence on Microsoft is an existential risk and they need something like the steamdeck that is independent of MS to survive as a company. But i fear that there will only be a honeymoon period after which Linux ends up as a battered wife.

I was re-considering my game-abstinence and getting a steamboy, because it looks like you could use it while lying on a sofa and there are a number of puzzel games like the ones from ZachtrPost too long. Click here to view the full text.
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 No.10713

>>10712
>I was re-considering my game-abstinence and getting a steamboy, because it looks like you could use it while lying on a sofa
Bad idea to sacrifice your abstinence for this. For a few games here and there a laptop on a sofa should do - since you say you'll install Arch anyway and go to GOG instead. Among popular puzzlers most work natively on Linux, and many of them are also on GOG. How large is the screen on this thing anyway? Most Zachtronics would be unplayable on a very small screen, and at least 3 of them have you write code which would also be a pain in the ass on this thing.
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 No.10714

>>10713
maybe you are right, I'll reconsider
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 No.10715

If you would buy a laptop or handheld for playing games on a sofa, consider getting an armchair (with a footrest) for your pc instead. It's really comfy :-)


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