Communication Privacy

Question 1

Anonymous communications - Abstract model

Answer 1

• Bitwise unlinkability: Crypto to make inputs and outputs bit patterns different
• (Re)packetizing + (re)schedule + (re)routing
  -> Destroy patterns
  -> Load balancing
  -> Distribute trust

Question 2

Goals for anonymous communication

Answer 2

• Sender anonymity
• Receiver anonymity
• Bidirectional anonymity
• 3rd party anonymity
• Unobservability
• Unlinkability