Problem
1. Compare the preshared-key methods in the main mode and aggressive modes. How much compromise is made in the aggressive mode with respect to security? What is the gain with respect to efficiency?
2. Compare the general public-key methods in the main and aggressive modes. How much compromise is made in the aggressive mode with respect to security? What is the gain with respect to efficiency?
3. Compare the revised public-key methods in the main and aggressive modes. How much compromise is made in the aggressive mode with respect to security? What is the gain with respect to efficiency?