Chapter 8, Problem 3RQ

Explanation of Solution

Cryptographic key:

The string of bits which is used to convert the plaintext to ciphertext and ciphertext to plaintext is known as cryptographic key.  This key used to manipulate the plain text to form a ciphertext.

Usage of Cryptographic key:

• The cryptographic key is used to ensure secure communication.
• It is used in both symmetric and asymmetric encryption...