Question: This problem compares MAC and HMAC when the key is known to the attacker. (1) Suppose that you know a MAC value X and the

This problem compares MAC and HMAC when the key is known to the attacker. (1) Suppose that you know a MAC value X and the key K that was used to compute the MAC, but you do not know the original message. Can you construct a message M that also has its MAC equal to X? (2) Suppose that you know the output of an HMAC is X and the key is K, but you do not know the message M. Can you construct a message M that has its HMAC equal to X, using the key K?

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

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 Databases Questions!

QUESTION 1 1. Suppose a company devises a security policy which specifies that only HR personnel are authorized to see payroll files. What type of mechanism is needed to implement the policy?...

Question 1 Suppose we define an encryption scheme as follows. The key will be four elements k 1, k 2, k 3, and k 4 in Z26. The message space will be sequences of elements of Z26 of length 6. The...

Cryptography question: Problem 4Flawed MAC designs, 24 marks For this problem, you need to carefully trace through the given MAC algorithms to understand the given attacks and explain how computation...

PowerPoint Assignment for BUS 401: Principles of Finance You have been asked by a manager in your organization to put together a training program explaining Net Present Value (NPV) and Future Value...

ANSI-SPARC6 Programming Language Compilation Write notes on each of the following topics: (a) the implementation of labels and jumps in a recursive, block structured programming language [7 marks]...

Hello my friend please assist me with my discussion Interest Rates Negotiation is a soft skill that might just be one of the most important skills you will ever learn. For this Discussion you will...

Set Student Name: 1. Answer true or false for each part, and if false, explain your answer. a. The point estimate for the population mean, , of an x distribution is x-bar, computed from a random...

Instuctor's Annotated Edition TENTH EDITION Understandable Statistics Concepts and Methods Charles Henry Brase Regis University Corrinne Pellillo Brase Arapahoe Community College Australia Brazil...

This text was adapted by The Saylor Foundation under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License without attribution as requested by the work's original creator or licensee. 1...

To be solved by DKetan. Describe the three methods used to allocate joint costs. What are the advantages/disadvantages of each allocation method? Which method would you recommend? Why? Support your...

The Orange County Spa began with 300 members. Those members had weights with a distribution that is approximately normal with a mean of 177 lb and a standard deviation of 40 lb. The facility includes...

You are a partner in Heureka & Associates, a firm of chartered accountants. The following issues have come to your attention; John is the second in command on the team carrying out due diligence...

A copy machine costs $ 4 9 , 0 0 0 when new and has accumulated depreciation of $ 4 2 , 0 0 0 . Suppose Copy Center discards tis machine and receves nothing. What is the result of the disposal...

D. Two containers contain a mixture of helium and nitrogen gas, both containers are at a pressure of 2 atm abs and 10 C. The first container contains 50 mol% helium and the second 40 mol% helium, If...

Are Pay Policies typically the same for all Occupation Groups in an organization?

Why are Medians sometimes more indicative of Central Tendency than are Averages?

What types of data are Dimensional Relational Databases in both RDMSs and OLAP Databases primarily designed to hold?