A technique referred to as a __________ is a mapping achieved by performing some sort of permutation on the plaintext letters.

A(n) ________ is a movement of the user's finger, fingers, or pen on a touch screen resulting in a particular action

Fill in the blank(s) with the appropriate word(s).

Show that byzantine agreement can be reached for three generals, with one of them faulty, if the generals digitally sign their messages.

What will be an ideal response?