Once an action is performed, it may not be undone even if it has not been too long. This property is referred to as: Unmotivated user property Barn door property Abstraction property O lack of...

Extracted text: Once an action is performed, it may not be undone even if it has not been too long. This property is referred to as: Unmotivated user property Barn door property Abstraction property O lack of feedback property O None of the above Question 5 One time pad is provably secure because: Onetime pad uses finite length key O Onetime palihuses 256 bit keys Onetime pad employs both substitution and tranposition In a onetime pad system, a key is never reused. Assuming that the key stream is random, the ciphertext is random as well, thus ensuring provable security None of the above