### Exercise: Public Key Cryptography ScenarioUsing public key cryptography, Bob wants to send a secret message M to Alice (only Alice and Bob should see M), and Alice wants to make sure that M is sent by Bob. Then Bob should:1. ⬤ sign the message, and send signature to Alice 2. ⬤ encrypt M with his public key, encrypt the result with Alice’s private key, and then send to Alice 3. ⬤ Answer is not given 4. ⬤ encrypt M with his private key, encrypt the result with Alice’s public key, and then send to Alice 5. ⬤ encrypt M with Alice’s public key and then send to Alice 6. ⬤ encrypt M with his public key, encrypt the result with Alice’s public key, and then send to Alice 7. ⬤ encrypt M with his private key, encrypt the result with Alice’s private key, and then send to Alice 8. ⬤ encrypt M with Alice's private key, encrypt the result with his private key, and then send to Alice When using public key cryptography, it is important to ensure both the confidentiality and authenticity of the message. Please analyze each option and choose the correct procedure for Bob to securely send the message to Alice while allowing her to verify that it was indeed sent by Bob.

Using public key cryptography, Bob wants to send a secret message M to Alice (only Alice and Bob should see M), and Alice wants to make sure that M is sent by Bob. Then Bob should: O sign the message, and send signature to Alice encrypt M with his public key, encrypt the result with Alice's private key, and then send to Alice O Answer is not given O encrypt M with his private key, encrypt the result with Alice's public key, and then send to Alice

Using public key cryptography, Bob wants to send a secret message M to Alice (only Alice and Bob should see M), and Alice wants to make sure that M is sent by Bob. Then Bob should: O sign the message, and send signature to Alice encrypt M with his public key, encrypt the result with Alice's private key, and then send to Alice O Answer is not given O encrypt M with his private key, encrypt the result with Alice's public key, and then send to Alice

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Consider an RSA key set for Alice with p = 23, q = 17, n = 391 and e = 15.a) Her public key is (e, n) = (15, 391). Is her private key (d, n) = (47, 391)? JusVfy your answer. b) Suppose Bob wants to encrypt a message 90 for Alice using RSA keys for confidenVality. Whatis the corresponding cipher text?Justify your answer.
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Alice encrypts a message using AES, and sends the ciphertext to Bob. Unfortunately, during the calculation of the third block, a lightning struck Alice’s house, corrupting the 2nd bit of the AES output (for the third block). Fortunately, nothing else of the calculation was affected. How much of the plaintext can Bob still recover if the mode of encryption is one of the followings: CBC, CFB, OFB, or CTR?
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Bob's El Gamal prime number is p=907 and his secret key is a=16. Alice has encrypted x=13 for sending to Bob and her ciphertext is (37,♦). What is ♦ (mod p)? Select one: a. 512 b. 418 c. 253 d. 96 e. 419
Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. We conduct a known-plaintext attack against an LFSR. Through trial and error we have determined that the number of states is m = 4. The plaintext given by 01100101 —D ХоXјX2XҙX4X5X6X7 when encrypted by the LFSR produced the ciphertext 10010100 — Уo У1 У2 Уз Уз У5 У6 Ут- What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 0101 to represent P3 = 0, p2 = 1, Pi = 0, po = 1).
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