The key schedule results in generating multiple keys from the one secret key. Th

Question

The key schedule results in generating multiple keys from the one secret key. These multiple keys are used?

(A)

in multiple sessions of communications one after the other. For example, if someone has 12 keys, they can use it for twelve video calls one after the other.

(B) such that one of them is picked up at random at a time.

some as private keys, some as public keys.

for different rounds of encryption for the same plaintext to strengthen the cipher.

(A)

in multiple sessions of communications one after the other. For example, if someone has 12 keys, they can use it for twelve video calls one after the other.

(B) such that one of them is picked up at random at a time.

some as private keys, some as public keys.

for different rounds of encryption for the same plaintext to strengthen the cipher.

Explanation / Answer

(D) is the correct option to the best of my knowledge.

The algorithms that use key scheduling like AES uses multiple rounds of encryption for the same plain text to strengthen the cipher text.

Option (A) is not correct as in the case of key scheduling the generated keys are not used in multiple sessions of communications one after the other.

Option (B) is not applicable in the case of key scheduling as in key scheduling the key used to encrypt is not selected randomly.

Option (C) is not correct as in the case of key scheduling the generated keys are not devided into public and private key category randomly.

Hope this helps.

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