

End-to-end encryption is the one of the most basic requirements for a communication system to be secure. Endpoint authentication is another. Message authentication is the third. After those 3 are fulfilled, further requirements can vary from system to system.
It’s like electrical or building code. Just because it’s compliant doesn’t mean it’s safe, but if it’s not compliant it’s almost certainly not safe. Necessary, not sufficient!











The oldest fossils known are stromatolite fossils from 3.48 billion years ago. There are living stromatolites today. They predate Earth having significant oxygen in its atmosphere, because the cyanobacteria that formed them created the oxygen gas through photosynthesis from carbon dioxide. They’ve orbited the galaxy over fifteen times.