Question: The nonce in Figure 31.22 is to prevent a replay of the third message. Eve cannot replay the third message and pretend that it is

The nonce in Figure 31.22 is to prevent a replay of the third message. Eve cannot replay the third message and pretend that it is a new request from Alice, because when Bob receives the response, the value of R_B is not valid anymore. This means that we can eliminate the first and the second message if we add a timestamp to the diagram. Show a new version of Figure 31.22 using a timestamp.

Step by Step Solution

★★★★★

3.30 Rating (153 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

The following shows the new diagram The ti... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Computer Networking Questions!

In Figure 31.9 we have a swapper in each round. What is the use of this swapper? Figure 31.9 64-bit plaintext DES 32 bits 32 bits 41 Initial permutation K1 Round I 48-bit f( R1. K ) K; Round i 56-bit...

Write a program that enables any number of clients to chat. Implement one server that serves all the clients, as shown in Figure 31.22. Name the client Exercise31_10Client and the server...

You may have noticed that there is a flaw in Figure 31.26. Eve, the intruder, can replay the third message and, if she can somehow get access to the session key, can pretend to be Alice and exchange...

Replay Attacks On Monday, Alice uses trusted third party Cathy to establish a secure communication session with Bob. The attached file homework5.pdf contains three slides that show three different...

Replay Attack Problem: Please provide an explanation of the answer, please! Replay Attacks On Monday, Alice uses trusted third party Cathy to establish a secure communication session with Bob. The...

Computer Security - Replay Attacks -multiple choice question Replay Attacks On Monday, Alice uses trusted third party Cathy to establish a secure communication session with Bob. The picture below...

Question 6 Alice wants to authenticate herself with Bob. Now, Bob to prevent DOS attack decides not to store any state (e.g., not to remember any random number). So the protocol they come up with is...

Computer Security question, please help me figure it out. I will give thumb up. Thank you Replay Attacks On Monday, Alice uses trusted third party Cathy to establish a secure communication session...

There are two problems due this week (each worth 35 points) as follows. Case 5-1David L. Miller: Portrait of a White-Collar Criminal (page 144). In comprehensive paragraphs, answerrequirements 1?6....

Opening Statement for Defense The 1948 U.S. Presidential election was a hard fight for Harry Truman. No one thought he had a shot and the folks at the Chicago Daily Tribune didn't think so either. At...

Lyme disease is an inammatory disease that results in a skin rash and ulike symptoms. It is transmitted through the bite of an infected deer tick. The following data represent the number of reported...

A diffraction grating has resolving power R = avg/ = Nm. (a) Show that the corresponding frequency range f that can just be resolved is given by f = c/Nm. (b) From Figure show that the times required...

Case study: 6 5 - year - old woman visits her primary care physician for an annual checkup. States "I feel that I am in good health." She recently began taking a multivitamin because she claims she...

How branding has developed

How does a VLAN reduce network traffic?

Does each port of the switch in Figure 17.3 need a link-layer address? Explain. Figure 17.3 Figure 17.3 Link-layer switch Switch Switching table Address Port 4 71:2B:13:45:61:41 71:2B:13:45:61:42 2...

What is the basis for membership in a VLAN?

An IBM bond pays 7% interest, and a Florida State bonds pays 5%. If you are in a 40% tax bracket, which should you purchase? ( Assume that the level of risk is the same for both bonds.)

You own a portfolio consisting of the following stocks: Percentage of Portfolio, Beta, Expected Return 1. 5% 1.20 14%, 2. 25 0.65, 10, 3. 15 1.00 12, 4. 20 1.4 16, 5. 35 0.90 11. The risk-free rate...

1. A law firm plans to invest in a small business computer system. The initial investment is $35,000. The firms tax rate is 40%. The computer system should provide additional revenue of $25,000 per...