Private, remote communication was not a thing until a couple of decades ago: how can we consider it a basic human right?
I can tell you that government surveillance of private communication has at least been a widespread concern for thousands of years. See for example: https://classicalstudies.org/imperial-spies-and-intercepted-....
Many countries have centuries-old constitutional guarantees of the right to secrecy of correspondence: https://www.marottaonmoney.com/right-to-privacy-of-correspon....