9. Explain the difference between IDS and Firewalls a. Bob has received a message from Alice. The message is encrypted with Bob's public key (that Alice has obtained from a Certification Authority (CA)). Bob can read the message after decrypting it with his private key. What does Bob now for sure? b. If Alice wants to send an email with confidentiality, message integrity and sender authentication, what keys does she have to use and what steps does she have to take? c. Is using public / private key encryption is more secure than using symmetric key encryption?

9. Explain the difference between IDS and Firewalls a. Bob has received a message from Alice. The message is encrypted with Bob's public key (that Alice has obtained from a Certification Authority (CA)). Bob can read the message after decrypting it with his private key. What does Bob now for sure? b. If Alice wants to send an email with confidentiality, message integrity and sender authentication, what keys does she have to use and what steps does she have to take? c. Is using public / private key encryption is more secure than using symmetric key encryption?

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

Based on the book Computer Networking

9. Explain the difference between IDS and Firewalls
a. Bob has received a message from Alice. The message is encrypted with Bob's public
key (that Alice has obtained from a Certification Authority (CA)). Bob can read the
message after decrypting it with his private key. What does Bob now for sure?
b. If Alice wants to send an email with confidentiality, message integrity and sender
authentication, what keys does she have to use and what steps does she have to
take?
c. Is using public / private key encryption is more secure than using symmetric key
encryption?
d. Why do we also use symmetric key encryption?

System that digitally connects two or more computers for the purposes of communication and/or sharing resources. These networks may be composed of general or specialized hosts, PCs, servers, or networking hardware.

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