Certificate? What Certificate?

• Recipient needs some way to securely associate a public key with the sender's IP address.

• One answer is an address-based pki.

  • Not a PKI, a pki -- this one is small and local.

• Could cryptographically generate IP address from public key.

  • 63 bits isn't very many -- could an enemy precompute?
  • Use timestamp to nearest hour in the generation?