Hello, Everyone.  I learn much, here.
 
There are three  (3) major situations where encryption is really helpful.  1) encrypting a Password in the Log-on / Access Control activity . 2) Creating a new password or Message Authentication Code (MAC)  and   3) Using encryption to support and provide for a Digital Signature.  
 
As Information Technology evolved from "mainframe" computers, "minicomputers" "LAN's" and Laptop PC's , notebook PCs were installed used and connected around the world, so did the need for people to install and maintain them.
Those are my concerns about when to use encryption. I always use https:/
And, with so many things; tinkering, tampering, sabotaging, tapping, thumping, and corrupting all things techologic has occurred.     Sometimes, I get frustrated with what I understand the legal system is NOT doing. 
  
I should feel free to modify my use of an AES  Algorithm ( 24--64 bit pre-whitening with Rijndael, Twofish, Serpent, RC6, MARS ) ; applying a larger-than-standard keysize ( i.e: 384--576 bits of key ) ; in a well engineered metal box (form factor) .    We should not feel a need to Destroy/Zeroize our systems, when the Feds come knocking on our door.
If I encrypt messages about my plans, they should be secure until I change them ( and escape )
 
It is frustrating, the current situation.  Lots of food for thought.
 
Best wishes to all.
 
Joe
 
end: 2:35PM; 14MAR2014 --
---