What is network security? Secrecy: only sender, intended receiver should understand"msa contents o sender encrypts msg o receiver decrypts msg Authentication: sender receiver want to confirm identity of each other Message Integrity: sender, receiver want to ensure message not altered (in transit, or afterwards)without detection 7: Network Security 37: Network Security 3 What is network security? Secrecy: only sender, intended receiver should “understand” msg contents  sender encrypts msg  receiver decrypts msg Authentication: sender, receiver want to confirm identity of each other Message Integrity: sender, receiver want to ensure message not altered (in transit, or afterwards) without detection