I don't know the full scope of what ITU does, but I do know they are responsible for the X.509 specification[0]. It's a cornerstone upon which Public Key Infrastructure (PKI) is built. HTTPS, TLS, etc. would not be the same without ITU.<p><a href="https://www.itu.int/rec/T-REC-X.509" rel="nofollow">https://www.itu.int/rec/T-REC-X.509</a>