4. Compare the following schemes for obtaining Bob's public key, in terms of bandwidth and computation efficiency, security, flexibility, and any other criteria you can think of: down- loading Bob's key from the node located at a particular IP address (via an unauthenticated interaction), looking up Bob's key in a directory via an unauthenticated interaction, having an authenticated conversation to the directory, having the directory sign the information you request, storing and retrieving certificates from the directory, having no directory but having each principal responsible for keeping its own certificate and sending it to someone who needs to talk to it.

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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4. Compare the following schemes for obtaining Bob's public key, in terms of bandwidth and
computation efficiency, security, flexibility, and any other criteria you can think of: down-
loading Bob's key from the node located at a particular IP address (via an unauthenticated
interaction), looking up Bob's key in a directory via an unauthenticated interaction, having an
authenticated conversation to the directory, having the directory sign the information you
request, storing and retrieving certificates from the directory, having no directory but having
each principal responsible for keeping its own certificate and sending it to someone who
needs to talk to it.
Transcribed Image Text:4. Compare the following schemes for obtaining Bob's public key, in terms of bandwidth and computation efficiency, security, flexibility, and any other criteria you can think of: down- loading Bob's key from the node located at a particular IP address (via an unauthenticated interaction), looking up Bob's key in a directory via an unauthenticated interaction, having an authenticated conversation to the directory, having the directory sign the information you request, storing and retrieving certificates from the directory, having no directory but having each principal responsible for keeping its own certificate and sending it to someone who needs to talk to it.
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