QUESTIONS (20 marks) Figure 4 shows an online banking system as the case study. Based on the system, discuss in detail any possibility of protocol implementation involved (keys, algorithms) for each of the following services that can be applied using public-key cryptography (a) Authentication and confidentiality. (10 marks) (6) Authentication and integrity. (10 marks) Phone Wireless Broadband Internet Banking Customer Customer ISP Provider Vendor ISP Firewall Network IDS RoutedFirewall Internet Banking Website Server Server thost-based IDS) Chost-based IDS) Transactions and Account Balance Updates private dedicated ine, encrypted file transfer Core Banking System BANK Firewall Network IDS Provider's Network Figure 4: Online Banking System