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Write advantages and disadvantages of chronological and targeted resume
USC UPSTATE
CSCI 455: Computer Security
Spring 2019
Homework Assignment 6
Problem 1
Visit the site www.wellsfargo.com, read its certificate and find the following information.
a) [2 Points] Which CA issued and signed the certificate?
b) [2 Points] What is the subject’s identity? That is, to which company and Website is the certificate issued?
c) [2 Points] Which digital signature scheme and hash function is used to sign the certificate?
d) [2 Points] Which public-key encryption scheme is used to secure the communication between your browser and the site www.wellsfargo.com and what is the length of the public key?
e) [2 Points] Which private-key encryption scheme is used to secure the communication between your browser and the site www.wellsfargo.com and what is the length of the key?
f) [30 Points] What is the certification path for www.wellsfargo.com, and how does your browser verify the certification path when you visit the site? Be sure to include every step of the verification.
Problem 2
This question refers to the key exchange protocol described on Slide 8 of the lecture on Key Exchange and Hybrid Encryption (Lecture 4, Part II). In class we showed that the given protocol is secure against passive attackers, i.e. attackers who can only eavesdrop and intercept the messages exchanged between Alice and Bob.
a) Show how an active attacker can break the protocol. Recall that an active attacker is one who can not only eavesdrop, but can also block and alter messages on the network, and inject his own messages into the network.
b) Show how to secure the protocol against active attackers if a secure PKI is available.
Problem 3
During the discussions on PKI and SSL, we emphasized the importance of the integrity of the certificate authority (CA). What damages can an attacker cause if he is able to compromise a trusted CA? Be as comprehensive as you can in your answer, and use a good concrete example to illustrate your answer.

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