Preventive Controls Listed below are five scenarios. For each scenario, discuss the possible damages that can occur. Suggest a preventive control.

a. An intruder taps into a telecommunications device and retrieves the identifying codes and personal identification numbers for ATM cardholders. (The user subsequently codes this information onto a magnetic coding device and places this strip on a piece of cardboard.)

b. Due to occasional noise on a transmission line, electronic messages received are extremely garbled.

c. Due to occasional noise on a transmission line, data being transferred is lost or garbled.

d. An intruder is temporarily delaying important strategic messages over the telecommunications lines.

e. An intruder is altering electronic messages before the user receives them.