CompTIA Security+ (SY0-501) — Question 100

When sending messages using symmetric encryption, which of the following must happen FIRST?

Answer options

• A. Exchange encryption key
• B. Establish digital signatures
• C. Agree on an encryption method
• D. Install digital certificates

Correct answer: C

Explanation

The first step in symmetric encryption is to agree on an encryption method, as both parties need to know how the data will be encrypted and decrypted. Without this agreement, the other options, such as exchanging keys or installing certificates, cannot be effectively implemented since the method of encryption has not been established.