Which of the following is a characteristic of the initialization vector when using Data Encryption Standard (DES)?
A. It must be known to both sender and receiver.
B. It can be transmitted in the clear as a random number.
C. It must be retained until the last block is transmitted.
D. It can be used to encrypt and decrypt information.
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An initialization vector (IV) is an arbitrary number that can be used along with a secret key for data encryption. This number, also called a nonce, is employed only one time in any session.
It’s just a guess,,, Question sentence is wrong.
I think correct question is “What is the following is NOT a characteristic….”
then, answer is “C”
not sure what this question is asking.
The key that DES uses must be known to the sender and receiver and can be used to encrypt and decrypt info since it is a symmetric encryption method.