Alice sends a message to Bob, along with a digital signature created by encrypting a hash of he message. Which key did Alice use to encrypt the hash? Why is that the appropriate key? Which key will Bob use to verify the digital signature? Why is that the appropriate key?

Can you decrypt the hash of a message to get the original message? Explain your answer?

How is the hash value of a message protected? Does it function without the secret key?

Which of the following statement is true when Alice sends a digitally signed message to Bob? a. Alice encrypts the plain-text message using Bob's public key. b. Alice uses symmetric encryption to perform this operation. O c. Bob uses his private key to validate the signature. O d. Alice uses her private key to digitally sign the message.

Can a hash value be protected such that it may be used for message authentication? Is it possible to attack a MAC technique without discovering the key's ciphertext?

. Q: There is no authentication in the Diffie-Hellman key-exchange protocol. By exploiting this property, a malicious third party, Chuck, can easily break into the key exchange taking place between Alice and Bob, and subsequently ruin the security. Explain how this would work.

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Alice and Bob agree to use the prime p = 1373 and the base g = 2 for communications using the Elgamal public key cryptosystem. Bob chooses b = 716 as his private key, so his public key is B ≡ 2716 ≡ 469 (mod 1373). Alice encrypts the message m = 583 using the random element k = 877. What is the ciphertext (c1, c2) that Alice sends to Bob?

No plagarism please! Correct and detailed answer will be Upvoted else downvoted. Thank you!

Study the diagram below showing the steps for Bob to send a digitally signedmessage to Alice and then answer the questions that follow: The statements below are the text version of the illustrated steps(step one to step five in the diagram above).Read each statement (step) and then correct all that are false.These are the steps for Bob to send a digitally signed message toAlice: StepNumber Statement 1 After creating a memo, Alice generates a hash on it. 2 Bob then encrypts the hash with a public key. Thisencryption is a digital signature of the hash. 3 Bob only sends the digital signature to Alice. 4 When Alice receives them, she descripts the digitalsignature using Bob’s public key, revealing the hash. 5 Alice then hashes the memo with the different hashalgorithm Bob used and compares the result to thehash she received from Bob.   You have verified that the correct keys have been used either encrypting and/ordecrypting the digital signatures as well as the correct has…