Can QR code be used to send data?

My cousin was telling me about his online exams and how there's a rumor that the exam board placed qr codes on the screen that can't be seen. If a student were to take a picture of the screen, the examiner will receive information that the student is cheating. I'm not sure how true this is.

submitted by /u/Man_highcastle
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from hacking: security in practice https://ift.tt/3vaUE8u

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