Accounting Information Systems 8th Edition by James Hall

Exercise 17

PREVENTIVE CONTROLS
Listed here 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. Because of occasional noise on a transmission line, electronic messages received are extremely garbled.
c. Because of occasional noise on a transmission line, data being transferred are 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.