I have developed a QR code generation code for a client; however, they expect another QR code (visually) than what my code generates.
Although, I respected all the configuration of QR generation, but that seems to be issue there.
Hence, is it possible to reverse engineer the configurations from a QR code?
Related
The context of this problem is weird (a magic trick that occurred to me), so I will skip that explanation and go straight to the point.
What I want: a set of QR codes (it can be just 1, or 2 different ones, either way will work for me). These QR codes may be scanned with a regular smartphone QR scanner to show some kind of text. My initial idea was a simple HTML page with the message in plain text. The difficult part is this:
Whenever someone scans the QR for the first time, certain message is show. But the second time, another message is shown. If it's just one QR code, I would like it to follow that sequence (alternating between the two messages). If there are 2 QR codes, I would want the first one scanned to display the first message (always) and the second one scanned to show the second one (always); the first scanned QR would determine which message will be shown in each one. The scan of one QR by one cell should not affect the scan of another phone (their functionality flow is independent).
I got some limitations though:
It must work just with the QR scanner a regular Android smartphone has (don't want the person installing any app).
I would like avoiding having to pay a server to store a page that has the functionality. The ideal scenery is the QR behaving like this by itself (maybe containing the proper script inside the QR).
I know how to generate QR codes and how to store HTML code in them using data:text/html protocol. My problem is the design of this functionality. Is there a way I can embed that functionality into a QR code (or two) without it being an URL to a web that stores the functionality? If not, which is the easiest way to achieve this?
Any help will be appreciated, thanks in advance.
this is my 1st question here but i guess i'll keep it short.
I'm currently working on an app to scan QR codes and came across a code that cant be scanned.
After some testing, I found out that the QR scanner app (from playstore) works but the output looks different from the original printed QR code. May I know why?
Thanks for any tips :)
Printed code
Code detected by the app
I am using Google Charts API to generate QR code as referred in this link https://www.gregorystrike.com/2011/01/26/how-to-use-google-charts-api-to-generate-your-own-qr-code/
In this as the parameters are visible it seems to be insecure
Users can change the values available in the parameters using developer tools like inspector element of Firefox. Is there a secure way to generate QR codes
Thanks
QR codes are insecure anyway, anyone can see the data you place in it, by using any reader.
If want to use QR Codes in any sort of secure sense or to store sensitive data you will have to manage encryption and decryption of that data yourself, there a few encrypted examples but its not a heavily used function. Now we are past the Fab stage of QR Codes, they mainly used like barcodes for identification, with the ability to store more information if needed and the odd URL embedded link.
Although the limit is quite large this is still a limit to the amount of data you can place in a QR Code.
Lots of information on the Wikipedia page https://en.wikipedia.org/wiki/QR_code
I have some member cards with a QR code printed on them. How can I read the code, and then generate the exact same QR code, so I can have the picture of the code and attach it to other documents.
I've tried app qr readers, and online qr generators, but it always generates a different qr code.
Thanks!
I am planning to explore on QR code generation . I saw the google api http://chart.apis.google.com/chart?cht=qr&chs=75x75&chl=test and its pretty impressive. But it works only for URL's and small data's. So i am thinking about writing a .net app to generate the QR code. So any information on libraries to start with ,will be helpful.
Thanks,
It does not just work for URLs. You can put whatever text you want as an argument (just URL-encode it correctly). It also works for any data size that QR codes can support.