Is it efficient to implement the DES (or 3DES) algorithm in software? Why is the implementation a target for hardware acceleration? How do we achieve authentication and privacy simultaneously by using...

Is it efficient to implement the DES (or 3DES) algorithm in software? Why is the implementation a target for hardware acceleration?

How do we achieve authentication and privacy simultaneously by using authentication header (AH) and encapsulation security payload (ESP) in IPSec?