SS7 may or may not have been intentionally backdoored at the time, but its development also predates the invention of the RSA algorithm upon which all modern se

SS7 may or may not have been intentionally backdoored at the time, but its development also predates the invention of the RSA algorithm upon which all modern security is founded. A key–exchange system like RSA or its successors is really required to do end–to–end encryption, and some sort of CA system is necessary if you are going have any hope of verifying that you are talking to the correct phone on the other end.