Given Information: It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K B + ,K B – ), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Answer 1

Question

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Can anyone please explain to me why we have such equations below in part b) and c)? They are the solutions to the questions, but I can't really understand why and how to get that. Many thanks. ==== QUESTION ==== In the Shamir secret sharing scheme, we distribute a secret among q different users as follows. If our secret is a message (m1, . . . , mk) from V (k, q) then, we encode it as a codeword of the Reed-Solomon RSk(q) and give one coordinate to each user. In this problem, we will use q = 7, k = 4 and the parity check matrix H4 below for RS4(7). H4 = [1 1 1 1 1 1 1, 0 1 2 3 4 5 6, 0 1 4 2 2 4 1] a) Write a generator matrix for RS4(7) b) A new secret is selected and user #1 receives share value 0, user #2 receives share value 6 and user #3 receives share value 1 and are collaborating to discover the new secret. Explain why they can’t recover the secret with only this information. c) Now, suppose users #1, #2 and #3 (as in the previous item) discover, in addition to the values of…

We know that a digital signature is for the purpose of ensuring data integrity and authenticity. a) Checksum adds all the bits of the message (or blocks), is checksum a good way to construct a digital signature scheme? How about a hash function, i.e, Sign(M)= h(M)?b) If we use a hash to generate a signature in a more complicated way as follows Sign(k,m) = σ = h(k) XOR m XOR h(m), and m, σ will be sent along. Would this be a secure signature? Briefly explain. please do not use chegg or ai tool like chat gpt please

Question 15 For Questions 15.1 - 15.2 consider the following integers: In a RSA cryptosystem with public- key (3233, 59), compute: 15.1 the private-key and give you final answer as an ordered pair (n, d).

Answer 2

Question

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Answer 3

Question

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Answer 4

Question

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Answer 5

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Answer 6

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Answer 7

Chapter 8, Problem P18P

a)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Answer 8

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Answer 9

b)

Program Plan Intro

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Answer 10

Expert Solution & Answer

Answer 11

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Answer 12

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Answer 13

Ch. 8 - Prob. R1RQ Ch. 8 - Prob. R2RQ Ch. 8 - Prob. R3RQ Ch. 8 - Prob. R4RQ Ch. 8 - Prob. R5RQ Ch. 8 - Prob. R6RQ Ch. 8 - Prob. R7RQ Ch. 8 - Prob. R8RQ Ch. 8 - Prob. R9RQ Ch. 8 - Prob. R10RQ

Given Information: It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K B + ,K B – ), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Solution Summary: The author explains that Alice wants to send an e-mail to Bob. Bob has a public-private key pair and Alice has Bob’s certificate. Alice and Bob share the same hash function.

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

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Chapter 8 Solutions

Given Information: It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K B + ,K B – ), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Solution Summary: The author explains that Alice wants to send an e-mail to Bob. Bob has a public-private key pair and Alice has Bob’s certificate. Alice and Bob share the same hash function.

Given Information: It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (KB+ ,KB–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Given Information: It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (KB+ ,KB–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Want to see the full answer?

Chapter 8 Solutions

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).

Given Information:

It is given that Alice wants to send an e-mail to Bob. Bob has a public-private key pair (K_B⁺ ,K_B^–), and Alice has Bob’s certificate. But Alice does not have a public, private key pair. Alice and Bob share the same hash function H(.).