Hidden

PROBLEM

My friend asked me to find his hidden flag in this link .. Can you help me?

Link

SOLUTION

When I tried to visit the website firfox popped up an error about some trusting issue on the certificate and there it was the flag.

FLAG Securinets{HiDDeN_D@tA_1n_S3IF_S3iGnEd_CeRtif1Cates}

Original writeup (https://github.com/mzfr/ctf-writeups/tree/master/Securinets_Prequals_2K19/misc/Hidden).