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1. Consider the following protocol for adding money to a debit card. (i) User inserts debit card into debit card machine. (ii) Debit card machine determines current value of card (in dollars), which is stored in variable x. (iii) User inserts dollars into debit card machine and the value of the inserted dollars is stored in variable y. (iv) User presses enter button on debit card machine. (v) Debit card machine writes value of x + y dollars to debit card and ejects card. Recall the discussion of race conditions. This particular protocol has a race condition. a. What is the race condition in this protocol? b. Describe a possible attack that exploits the race condition. c. How could you change the protocol to eliminate the race condition, or at least make it more difficu to exploit?

1. Consider the following protocol for adding money to a debit card. (i) User inserts debit card into debit card machine. (ii) Debit card machine determines current value of card (in dollars), which is stored in variable x. (iii) User inserts dollars into debit card machine and the value of the inserted dollars is stored in variable y. (iv) User presses enter button on debit card machine. (v) Debit card machine writes value of x + y dollars to debit card and ejects card. Recall the discussion of race conditions. This particular protocol has a race condition. a. What is the race condition in this protocol? b. Describe a possible attack that exploits the race condition. c. How could you change the protocol to eliminate the race condition, or at least make it more difficu to exploit?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. Consider the following protocol for adding money to a debit card. (i) User inserts debit card into debit card machine. (ii) Debit card machine determines current value of card (in dollars), which is stored in variable x. (iii) User inserts dollars into debit card machine and the value of the inserted dollars is stored in variable y. (iv) User presses enter button on debit card machine. (v) Debit card machine writes value of x + y dollars to debit card and ejects card. Recall the discussion of race conditions. This particular protocol has a race condition. a. What is the race condition in this protocol? b. Describe a possible attack that exploits the race condition. c. How could you change the protocol to eliminate the race condition, or at least make it more difficult to exploit?
Transcribed Image Text:1. Consider the following protocol for adding money to a debit card. (i) User inserts debit card into debit card machine. (ii) Debit card machine determines current value of card (in dollars), which is stored in variable x. (iii) User inserts dollars into debit card machine and the value of the inserted dollars is stored in variable y. (iv) User presses enter button on debit card machine. (v) Debit card machine writes value of x + y dollars to debit card and ejects card. Recall the discussion of race conditions. This particular protocol has a race condition. a. What is the race condition in this protocol? b. Describe a possible attack that exploits the race condition. c. How could you change the protocol to eliminate the race condition, or at least make it more difficult to exploit?
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