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These days, you can pay with a mobile phone QR code after buying something at a convenience store or mart. Because QR codes are encrypted, you think they are safe, but there are some things to be careful about.



Reporter Jang Hoon-kyung covered the details of the report.



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Calls are constantly coming in, day or night, on Christmas Day, or on New Year's Day.



It's already been five months.



It was an unfamiliar voice to a different number each time.



[Mr. Kim: (a day) How many ten, 20? I got it at 10:30 at night, and in the morning I started working. (Later) Maybe it's an address or something like that, so they know what to look for. I can't sleep at night because I'm so scared.]



Mr. Kim developed an app for a large company as a contract worker, and then phone calls started coming in.



It was an app that adds a payment function to a customer's QR code, but Kim's QR code was leaked during the app distribution process.



Hwageun is a payment application installation manual distributed by the company to marts nationwide.



After the app is originally downloaded, you need to install it yourself according to the manual.



However, some customers mistakenly thought that it was automatically installed when the QR code of the manual was scanned with a camera, and when the woman's phone number appeared in the QR code of the manual with the camera, they knew it as a guide number and called.



This manual was distributed to about 300 marts run by the company, and I asked the company to solve it, but to no avail.



[Mr. Kim: I'm so sorry, but I'm begging you, please don't call me.

Then (the company) will just check...

.

Rather, I have no choice but to say 'I'm sorry,' because I'm a freelancer anyway.]



People who install this payment app can suffer the same.



When you point the camera at the QR code generated by the app, your phone number appears, but there is no such explanation in the app.



If you inadvertently post a QR code on a blog, etc., you are likely to get frustrated.



[Blogger who posted QR code online: (Aren't you wondering how I got to know the teacher's contact information?) I didn't know, I was embarrassed when I suddenly got the call.]



[Kim Seung-ju/Professor, Korea University Graduate School of Information Security: When creating services using QR codes Much more than anything else, we need to fully inform our customers about safety...

.]



As the coverage began, the company apologized to the victim after 5 months and announced that they would supplement the QR code.



(Video coverage: Kim Heung-sik and Oh Young-chun, video editing: Jeon Min-gyu, VJ: Park Hyeon-woo)