Security Property 2:Confidentiality Confidentiality (secrecy) -Protect information from leaking. Two types: Message content confidentiality Message header confidentiality:who talks to whom is secret. -Mechanisms ●Encryption ●Traffic padding 55 Security Property 2: Confidentiality  Confidentiality (secrecy) ─ Protect information from leaking. ─ Two types: ● Message content confidentiality ● Message header confidentiality: who talks to whom is secret. ─ Mechanisms ● Encryption ● Traffic padding