Consider an Intel Xeon CPU based server at Citibank headquarters. When the teller using a PC at the Citibank branch office submits a query, the PC they$$re using encrypts it and then transmits it to the server which then decrypts it$,$ accesses account information on the server$$s disk, calculates compound interest balance, encrypts the result, and transmits the encrypted result to the PC at the branch office which then decrypts it$.$ The branch offices are located $45,000$ meters away and are connected to headquarters by a dedicated microwave antenna link. Any operations besides those mentioned are ignored.