Which of the following describes the first step in establishing an encrypted session

using a Data Encryption Standard (DES) key?

A. Key clustering

B. Key compression

C. Key signing

D. Key exchange

Key exchange

Explanation:

Key exchange (also key establishment) is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm. If the sender and receiver wish to exchange encrypted messages, each must be equipped to encrypt messages to be sent and decrypt messages received.