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Question 9: Using public key cryptography, X adds a digital signature ø to message M, encrypts < M, Ø >, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? 1. Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key 2. Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key 3. Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key 4. Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key 1 2 3 4

Question 9: Using public key cryptography, X adds a digital signature ø to message M, encrypts < M, Ø >, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? 1. Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key 2. Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key 3. Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key 4. Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key 1 2 3 4

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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Question 9: Using public key cryptography, X adds a digital signature ø to message M, encrypts < M, Ø >, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? 1. Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key 2. Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key 3. Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key 4. Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key 1 2 3 4
Transcribed Image Text:Question 9: Using public key cryptography, X adds a digital signature ø to message M, encrypts < M, Ø >, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? 1. Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key 2. Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key 3. Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key 4. Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key 1 2 3 4
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