When Two Parties Communicate with Each Other Using Symmetric Key

question 106

Multiple Choice

When two parties communicate with each other using symmetric key encryption, how many keys are used in total to encrypt and decrypt?

• A) 1
• B) 2
• C) 4
• D) 8

---

Definitions:

Ocular Lens

The lens within the eye that focuses light on the retina, enabling clear vision by adjusting its shape.

Objective Lenses

The lenses closest to the specimen in a microscope, essential for magnifying the image of the sample being studied.

Condenser

A device used to condense gas into a liquid by cooling it.

Nosepiece

Part of a microscope or other optical instrument where the selection of lenses occurs, also known as a turret.