Explain in detail, what is going on in this diagram? Note, you can refer to the Network Security PPT Lecture.

NETWORK SECURITY ASSIGNMENT Original message encrypted using User Y's public key Original message decrypted using User Y's private key OHS TS milk bread eggs cat food ..CIAS User X User Y Don't Forget the chocolate! Cho BAPO Db Sonte il Reply message decrypted using User X's private key Reply message encrypted using User X's public key