Bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption

(programming exercise 3-10). a retail company must file a monthly sales tax report listing the total sales for the month, and the amount of state and county sales tax collected. the state sales tax rate is 4 percent and the county sales tax rate is 2 percent. design a modular program that asks the user to enter the total sales for the month. from this figure, the application should calculate and display the following: - the amount of county sales tax - the amount of states sales tax - the total sales tax (county plus state) some of the code has already been provided below. complete the missing code below. // global constants for tax calculations constant real county_tax_rate = .02 constant real state_tax_rate = .04 // main module module main() // local variables declare real monthsales, countytax, statetax // get month sales display “enter monthly sales: ” input monthsales // write the statement to calculate county tax // write the statement to calculate state tax // display tax amount call showtaxes(monthsales, countytax, statetax) end module // the showtaxes module accepts monthsales, countytax, statetax // as arguments and displays the resulting data // write the showtaxes module