Alice's computer needs to have access to a symmetric key K A · Consider the following two methods for deriving and storing the key K A - (i) The key is generated as K A = h(Alice's password). The key...

Alice's computer needs to have access to a symmetric key K_A· Consider the following two methods for deriving and storing the key K_A-

(i) The key is generated as K_A
= h(Alice's password). The key is not stored on Alice's computer. Instead, whenever K_A
is required, Alice enters her password and the key is generated.

(ii) The key K_A
is initially generated at random, and it is then stored as E(K_A,K), where K = ^(Alice's password). Whenever K_A
is required, Alice enters her password, which is hashed to generate K and K is then used to decrypt the key K_A

Give one significant advantage of method (i) as compared to (ii), and one significant advantage of (ii) as compared to (i).