Discussion
wow
another falsely advertised “easy” challenge. no details just the 411: 1. first go here: https://zxing.org/w/decode.jspx and upload qr file (you should have already downloaded it from Mega into your Downloads dir/folder). 2. then go here: https://base64.guru/converter/decode/text and translate the base64 string into text. 3. finally go here: https://rot13.com/ and get the flag.
FYI LINKS: https://en.wikipedia.org/wiki/ROT13 https://niekdang.wordpress.com/2020/07/27/ctflearn-solution-qr-code/
THAT LAST LINK DESERVES A PAYCHECK FROM CTF”learn”: he or she did all the teaching for them.
always Remember: in hacking (as in life), the best ‘hack’ is Google (or duck duck go)
BTW: mltnlck has a much more elegant sol’n - if u know how to decode the qr in cyberchef (I do not - but i didn’t see his comment till post-solving anyways)
CAREFUL, SPOILERS:
I highly recommend Cyberchef to do this one. You can use the function "Parse QR-Code" to solve the first step. For step 2 you need to decode it. Try and figure out which format uses an "=" sign to fill up triplets at the end. The last one to me is actually quite hard to find out, if you don't know what to do. But you can see that the position of the ":" and the "_" already kinda makes sense. Maybe the letters just need some rotation?
3 weeks ago
cool :)