QR codes function,One of the many changes that the pandemic has brought about can be seen the increasing use of QR code. These are graphic representations of digital information that can be printed , and later scanned with smartphone or any another device.

QR codes are able to be used in an diverse range of uses that allow people to avoid contact with objects as well as close contact with others such as sharing menus of restaurants as well as registration on email lists, for details about sales on homes and cars as well as the process of checking into and out of professional and medical appointments.

The QR code is a similar cousin to bar codes found on the packaging of products that cashiers scan using infrared scanners. They inform the computer at checkout which products are being bought.

Bar codes are used to store information on one axis horizontally. QR codes store information on both horizontal and vertical Axioms and can store much more data. The extra data is why QR codes are flexible.

The anatomy of the QR code

Although it is simple to comprehend Arabic numerals, it’s difficult for computers. Bar code codes represent alphanumeric numbers as a set of white and black lines with different dimensions. When you shop bar codes are used to record the sequence of numbers that identify the ID of a product. Importantly, the information stored within barcodes is not reusable. 

Even if a part of the barcode is lost or obscured it’s still feasible for a device to identify the product’s ID.

QR codes are made to be scanned with cameras, like those on smartphones. The scanning of QR codes is integrated into a variety of camera applications that are available on Android as well as iOS. QR codes are primarily utilized to store links to websites however, they also save any kind of information, like images or text.

If you scan the QR code and then the QR reader inside your phone’s camera reads the code and the resultant information activates an action on your phone. When the code contains the URL it will display to you the link. Press it and the default browser of your phone will open the page.

The information in the QR code is a set of dots on an equilateral grid. Each dot is a one, while each blank represents one in the binary code and patterns represent sequences of letters, numbers or both, and include URLs. The smallest size of the grid measures 21, rows and 21 columns and at its highest, it’s 177 rows by 177 columns. 

In the majority of cases, QR codes use black squares with white backgrounds which makes the dots easy to differentiate. However, this isn’t an unavoidable requirement. QR codes can be made to use any color or design for their dots as well as background.

QR codes function

Position markers are squares positioned on the QR code’s top left or the bottom-left corner. They allow the camera on a smartphone or any other device figure out the orientation of the QR code as it scans it. QR codes are enclosed with blank spaces, referred to as the quiet zone, which helps the computer to determine the point at which the QR code starts and where it ends. QR codes may also include an optional logo to be placed in the middle.

Similar to barcodes and QR codes, QR codes are created with redundancy of data. Even if 30 percent or more of the QR code becomes damaged or is difficult to comprehend, the data can be recovered. Logos aren’t actually an element of the QR code. Rather, they mask certain QR code information. 

But, because of being part of the QR code’s redundancy, information represented by the dots that are missing is obtainable by studying the remaining dots.

Are QR codes dangerous?

QR codes are not necessarily risky. They’re merely a way to save information. But, just as it is risky to click on links in emails, accessing URLs in QR codes may be dangerous in a variety of ways.

The QR code’s URL could redirect you to a phishing site that attempts to get the user to enter your password or username to another site. The URL may lead the user to a genuine site and then trick the website to do something harmful for example, giving hackers the ability to access your accounts. 

Although this kind of attack is a result of an error on the site you’re on, these weaknesses are prevalent online. The URL may lead the user to malicious site that tries to trick another site you’re logged in to using the same device into taking an unauthorised action.

A malicious URL can bring up applications on the device, and trigger it to perform an action. You may have seen this happen when you clicked on a Zoom link then the Zoom application was opened and then automatically joined an event. Although this is usually safe, hackers could make use of this to trick applications into sharing your personal data.

It is essential that, when you click on a link within the form of a QR code that you verify it is secure and originates from a reputable source. The fact that a QR code contains an image that you recognize doesn’t mean that you must open the URL it has.

There’s also the possibility that the app that is that scans the QR code might have a vulnerability which allows fraudulent QR codes gain access to the device. The attack could be successful simply by scan the QR code even if you didn’t use the link that is stored within the code.

 To protect yourself from this attack it is recommended to use trusted apps supplied by the company that makes the device to read QR codes, and beware of installing custom QR code applications.

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