Yes And No
Yes, you can securely communicate internationally. No, don't use the cloud for that.
I am not going into the specifics here, but it will suffice to say that you should educate yourself towards wireless communications and what the NewZealanders did before they got the British machinery. Research how that guy Dönitz placed much too many faith into machines. That will tell you how to work around these pitfalls.
Go for the simple stuff, which can be directly understood. Infiltrate an amateur radio group and learn their stuff. View those videos on youtube. There's an almost global network out there which is virtually unknown and which is not being actively monitored on.
Biting the hand that feeds IT
