Q/answer in network security ?

b) When shopping at BMart, after you have selected your purchases, you take your cart full of goods to one of the registers. The check-out clerk scans your goods, totals what you owe and upon receiving payment from you gives you an itemized receipt. However, you cannot then simply exit the building with your goods. At the exit you are required to go to a staff member who inspects your receipt. If the receipts look okay (appears to match the number and types of items in your cart), the staff member draws a line with a permanent marker down the receipt and hands it back to you. At this point, you can exit the building and take the goods to your car. i. Identify TWO (2) security principles illustrated by BMart's approach. For each, describe what aspect of BMart's approach reflects the principle. ii. Identify an attack that BMart seeks to prevent by having the staff member draws the line down your receipt. Discuss how the attack works