All encryption algorithms are based on two general principles: ...

[berenicecastro]

All encryption algorithms are based on two general principles: _________, in which each element in the plaintext is mapped into another element, and transposition, in which elements in the plaintext are rearranged.
 
  What will be an ideal response?

Question 2

When designing software, how to manage the creation and the destruction of a large number of objects in an application is a ________ problem.
 
  A) one time
  B) unusual
  C) repeated
  D) common

[helenmarkerine]

Answer to Question 1

SUBSTITUTION

Answer to Question 2

C

[berenicecastro]

Excellent

[alvinum]

Thanks for the timely response, appreciate it