Internet Security Requirements/Threats

• Confidentiality: Protection from disclosure to unauthorized persons
• Integrity: Assurance that information has not been modified/changed unauthorizedly.
• Authentication: Assurance of identity of originator of information.
• Non-Repudiation: Originator cannot deny sending the message.
• Availability: Not able to use system or communicate when desired.
• Anonymity: For applications like voting, instructor evaluation.
• Traffic Analysis: Should not even know who is communicating with whom. Why?

And all this with postcards (IP datagrams)!