How to Decode a QR Code by Hand

Показать описание

⏰ Timestamps
0:00 Intro
0:19 Components of QR code
2:47 Decoding
8:42 Recap

🎬 Other videos

No One Asked

Рекомендации по теме

Комментарии

4:59 on the left QR 9 line is but on the right it jumps up (now XOR switches from 9 on 8 line) – why? is it mistake?

mrwicked

i will definitely try. i can't believe it's this simple, given that you are familiar with a Lagrange Polynomial.

robfielding

I guess such weird skill might be needed if one is assigned to work as an agent someday on some missions…

cheuk

You might laught, but I thought exactly «hmm what if such a weird video would exist, this is exactly what I would need», and here I am

saschavjater

Thank you very much. Now I'll put it to the test.

vids

Thanks bro...🎉... Finally i know it.. 🤧

PrakaS-qqmu

4:56 why does it use pattern 1 and why not 3, 4, 5??

sacima

Hi! You are really good at this, and you moved me closer to some answers. But maybe because of my non well english i missed some important information. Whats the logic that you use to split qr to sectors?
Because in my way i tried to decode QR by using your methodic (it was version 1 21x21 blocks). And i clearly know, that it starts from $ symbol (dec 36, 00100100 binary) but i cant get this combination even if i start from the bottom, what do i do wrong?

I started to understand QR logic because i spotted some interesting QR from one company. He seems like regular one but have some hidden information inside. I used all scanners online and apps to decrypt it, but nothing works. For example when I am scanning it, it shows WT:1:40:102 and based on version 3 (29x blocks), but when Im generating my one, exact the same message converts to version 1 (21x blocks). And when they scan my generated QR it on their software it shows that nothing store inside, but if they scan their own with exact same text but based on version 3, showing hidden content inside.

snaeyez