Homework Answers
a) Yes, this approach provide the confidentiality.
b) Because the message is appended with the s and it will be applied to hash fuction. after that again the message will be encrypted by the hash function (H(M||S)). So this approach provieds the confidentiality.
c) No, this approach does not provides message authentication.
d) Because, the sender will directly sending the message with out any authentication or sender private key.
so It doesn't provide any authentication.
If you have any doubt please comment.
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Compare HOIS (c) a. Does the above approach provide message confidentiality (Yes/No)? (* Mark) b. Explain...
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Consider the following scheme to provide message authentication. B gets a message supposedly from A, and B wants to make sure that the message was sent by A and not modified by BG along the way. A generates a secret key K for DES, calculates C = E_K (M), and sends M, C, K to B. B checks it M = D_K (C) and if it is, accepts that M was sent by A. Is this is a good scheme?...
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Question 2. Does message authentication imply user authentication? Is the opposite true? Explain your answer Message authentication is different from user authentication. Message authentication allows User authentication is used for access control and accountability.
b. Does this production function have an uneconomic region? If
yes, find the region.
c. Based on your answer to (b), sketch a graph of two isoquants
Q1 and Q2 withQ1 < Q2.
1. (12 points) Consider the production function Q = KL2-L", and answer the following questions. a. (4 pts) Does this production function exhibit diminishing marginal product of capital? Diminishing marginal product of labor? Explain.
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