What are the disadvantages of Shared Secret Key encryption?
A.
A secure channel is required by which correspondents can agree on a key before their first
encrypted communication.
B.
Correspondents may have to agree on a key by some other fairly secure method, such as by
mail or telephone.
C.
The number of keys required can quickly become unmanageable since there must be a
different key pair fir each pair of possible correspondents.
D.
B and C.
E.
A, B and C.
Explanation:
: Since Shared Secret Encryption (Symmetric) only has one key for encrypt-decrypt, you need to
use an alternative way to pass the shared secret, in our days, it’s usually done by telephone o
some secure methods that not involve the channel you are trying to secure. Also, since you need
one different key to encrypt-decrypt every connection, the number of keys gets huge in a little
time, for example, if we have 10 users trying to communicate between themselves, we have 100
different encryption keys to manage. There is an advantage for this, the encryption is very fast,
about 1000 times faster than asymmetric encryption.