Dynamic QR code


Recommended Posts

  On 04/05/2019 at 15:55, Deep_Level_Shark said:

Can anyone please help me to understand Dynamic QR code concept.

 

It is said that in Dynamic QR code , content changes......Does that mean the QR image that I see on screen is also changes ?  or  that QR image remains fixed but content changes ?

 

Expand  

 Not familiar with it but if the content changes, so does the image. The only way around that would be linking to a webpage and *that* content changes. 

I'm not entirely sure what you're referring to, but I can tell you that when using Google Authenticator and trying to pair it using MobileID the QR code changes every so often (every minute, perhaps).

 

So my answer would be that the QR code changes, not the content.

  On 04/05/2019 at 16:34, Nick H. said:

I'm not entirely sure what you're referring to, but I can tell you that when using Google Authenticator and trying to pair it using MobileID the QR code changes every so often (every minute, perhaps).

 

So my answer would be that the QR code changes, not the content.

Expand  

The content changes too. The content is used to form the image. 

  On 04/05/2019 at 16:35, adrynalyne said:

The content changes too. The content is used to form the image. 

Expand  

Fair enough. As I said, I wasn't entirely sure about the question being asked. What would "content" be? The content of the QR code? I would have thought that was static?

  On 04/05/2019 at 16:44, Nick H. said:

Fair enough. As I said, I wasn't entirely sure about the question being asked. What would "content" be? The content of the QR code? I would have thought that was static?

Expand  

Yeah that’s what I figured too. Unless it links to a webpage with the same url and it’s content changes. I would think it needs to be to do that. 

I'm guessing its a QR code that links to a redirector that can change where it redirects?

So the image never changes, it points to the same place, but that's just an intermediary step that forwards the client to the end result.  The intermediary step is what can be changed.

 

https://blog.qrstuff.com/2012/08/12/dynamic-qr-codes

Turns out, I'm basically correct.

  On 04/05/2019 at 17:10, Human.Online said:

I'm guessing its a QR code that links to a redirector that can change where it redirects?

So the image never changes, it points to the same place, but that's just an intermediary step that forwards the client to the end result.  The intermediary step is what can be changed.

 

https://blog.qrstuff.com/2012/08/12/dynamic-qr-codes

Turns out, I'm basically correct.

Expand  

Okay.  image never changes then....fine. 

 

so when you use a scanner to read this QR code , your scanner device will show you same content every time ?  yes/no ?

 

( scanner device cant redirect)

 

I'm still confused.

Edited by Deep_Level_Shark
  On 04/05/2019 at 17:49, Deep_Level_Shark said:

Okay.  image never changes then....fine. 

 

so when you use a scanner to read this QR code , what your scanner device will show to you ? Does it show  a URL as content from this QR code ?

 

I'm still confused.

Expand  

It shows a url that redirects to whatever. QR codes only show what they are encoded to show. They cannot show anything else without changing the image. You can change where the url goes to though. 

 

Example. I have a redirect called foo.com. I make a QR code. It points to foo.com. Foo.com this week redirects to google.com. Next week, I’ll change it to redirect to bing.com. Foo.com didn’t change, so the image didn’t change. 

  • Like 1
  On 04/05/2019 at 17:49, Deep_Level_Shark said:

Okay.  image never changes then....fine. 

 

so when you use a scanner to read this QR code , what your scanner device will show to you ? Does it show  a URL as content from this QR code ?

 

I'm still confused.

Expand  

The URL that's in the QR Code is the same.  But it links to a redirector that can be changed. 

qrcode -> qr.redirect.com/[yourid] -> [your site]

ie:
qrcode -> qr.redirect.com/123 -> neowin.net
qrcode -> qr.redirect.com/123 -> neowin.com

 

So the QR code ALWAYS goes to qr.redirect.com/123 but you change where qr.redirect.com/123 goes to.

  On 04/05/2019 at 17:49, Deep_Level_Shark said:

Okay.  image never changes then....fine. 

 

so when you use a scanner to read this QR code , your scanner device will show you same content every time ?  yes/no ?

 

( scanner device cant redirect)

 

I'm still confused.

Expand  

The QR code image never changes.

The QR code content never changes - it always links the client to a url, the same url every single time.

 

BUT

 

That URL is just a forwarder.  Like a url shortener it then sends the user on the the page that it is "CURRENTLY" meant to.

 

 

  On 04/05/2019 at 18:28, exotoxic said:

My bus "e-ticket" uses an animated QR code which changes every 2 - 3 seconds the scanner is faster than the changes so i am not sure what purpose it actually has.

Expand  

An extra level of authentication.  You can't take a sreenshot and send to your mate.

  On 04/05/2019 at 18:00, adrynalyne said:

It shows a url that redirects to whatever. QR codes only show what they are encoded to show. They cannot show anything else without changing the image. You can change where the url goes to though. 

 

Example. I have a redirect called foo.com. I make a QR code. It points to foo.com. Foo.com this week redirects to google.com. Next week, I’ll change it to redirect to bing.com. Foo.com didn’t change, so the image didn’t change. 

Expand  

How it redirects ? 

 

Is it like this ?

a  person scans first with his scanner device and he found out that  it is  foo.com after scan ....he then opens chrome browser and typed foo.com and hit enter.

 

 

 

  On 05/05/2019 at 02:39, Deep_Level_Shark said:

How it redirects ? 

 

Is it like this ?

a  person scans first with his scanner device and he found out that  it is  foo.com after scan ....he then opens chrome browser and typed foo.com and hit enter.

 

 

 

Expand  

Pretty much. Then foo.com goes wherever it is set to. 

  On 05/05/2019 at 03:52, adrynalyne said:

Pretty much. Then foo.com goes wherever it is set to. 

Expand  

 

what you are trying to say here , in simple words , is

 

if your content is a Link  then its a Dynamic QR Code.

if your content is Not a  Link ( but text only)  then its a Static QR Code.

 

Is it really the difference between Dynamic QR Code and Static QR Code ?

 

This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • So is Ubuntu and Fedora (with GNOME). It's a welcome move and those that need X11 can easily install as pointed out in the article it but that won't stop a loud minority from whining of course. Funny but It will actually be easier to install X11 on Ubuntu then enable Flatpak support/Flathub and use them.
    • End of an era? Kubuntu is removing default support for X11 in new installs by David Uzondu X11, the old window system whose days have long felt numbered, just saw another one of its major supporters head for the exit. Kubuntu has decided to follow its parent distro's lead, making its next release, version 25.10, a Wayland-only affair for fresh installs. It seems many Linux developers see Wayland as the future. Just recently, Linux Mint started working to improve support for the protocol in Cinnamon, tackling lingering issues with keyboard layouts and input methods. You can even see the progress in KDE's development, where an upgrade to Wayland PiP is planned for KDE Plasma 6.5. So what's the logic behind dropping a session that, for the most part, still works? According to Kubuntu's Rik Mills, the team wants to "rip off this sticking plaster" now, in an interim release, rather than ###### off a lot of people by doing it in the next Long-Term Support version, 26.04. The developers feel that maintaining code for the aging X11 system holds back progress on security and new features that Wayland can enable more easily. Plus, supporting two separate display servers is a massive undertaking. Of course, this change might have some people worried, but relax; all is not lost if you still need the old session. If you're running hardware that acts up, like some older NVIDIA cards, or who relies on an ancient application that doesn't play nicely with the XWayland compatibility layer, you can still get your familiar session back. Just enter the following command in your terminal: sudo apt install plasma-session-x11 Once that command finishes, the X11 session will appear as an option on the login screen, so you can carry on as before. As OMGUbuntu notes, not everyone in the Ubuntu family is following its lead just yet. Other official flavors like Xubuntu, Ubuntu Budgie, and Ubuntu Cinnamon are expected to keep offering an X11 session on their default installs for this cycle.
    • Mangohud hasn't been built into "Steam Deck", it has been built into SteamOS. I understand that your goal is to try and praise MS for a simple feature that everyone else has, but we are comparing OS vs OS. Hardware does not have anything "built-in". Software does. Like it or not, SteamOS has it "built-in". And it is far superior to XBOX game bar's information.
    • Please don't inject yourself into a discussion you did not read or understand what was said. No where did I say Windows was hard to use. I knew when seen two notifications with your handle the replies they were going to be a waste of time to read.
  • Recent Achievements

    • First Post
      Johnny Mrkvička earned a badge
      First Post
    • Week One Done
      viraltui earned a badge
      Week One Done
    • One Month Later
      serfegyed earned a badge
      One Month Later
    • Dedicated
      firey earned a badge
      Dedicated
    • Dedicated
      fettermanj earned a badge
      Dedicated
  • Popular Contributors

    1. 1
      +primortal
      643
    2. 2
      Michael Scrip
      221
    3. 3
      ATLien_0
      218
    4. 4
      Steven P.
      143
    5. 5
      Xenon
      142
  • Tell a friend

    Love Neowin? Tell a friend!