QR Code
1 minute to read
We are given an image containing a QR code:
If we scan it, we will get this string:
c3ludCB2ZiA6IGEwX29icWxfczBldHJnX2RlX3BicXI=
It seems to be encoded in Base64, let’s try to decode it:
$ echo c3ludCB2ZiA6IGEwX29icWxfczBldHJnX2RlX3BicXI= | base64 -d
synt vf : a0_obql_s0etrg_de_pbqr
But we don’t see anything readable. There seems to be a substitution algorithm such as ROT13. Let’s go to CyberChef and check it out:
We see: “flag is : n0_body_f0rget_qr_code”, so the flag is: CTFlearn{n0_body_f0rget_qr_code}
.