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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)
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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### Exercise: Public Key Cryptography Scenario 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: 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.
Transcribed Image Text:### Exercise: Public Key Cryptography Scenario 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: 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.
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