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