I file electronically and have for about five years.
I only have to file a Federal return because I live in a state with no income tax (you might want to consider that).
If you use a service like Free Fill-able Forms, it is linked to a secure server and requires a new user name and password each time. It is even more secure if you are using a VPN at home.
As for your SSN, address etc. - they are already out there, courtesy of multiple credit report hackers, and not just on the "dark web", either.
The best you can do is to keep your own PC and home network secure by using antivirus software, anti-malware/spyware, and a virtual private network.
And never pay the IRS a cent more than you have to - take advantage of every exemption, deduction and tax deferral that you can, legally.