Alice wants to communicate with the www.vu.nl Web site, but the entry for this domain in her name server was poisoned so that the packets end up at an attacker-controlled machine. To what extent is the attacker able to compromise Confidentiality, Integrity, and Authenticity in the following cases: (a) unencrypted (http) communication between Alice and www.vu.nl, (b) encrypted (https) communication between Alice and www.vu.nl when the Web site uses a self-signed certificate, (c) encrypted (https) communication between Alice and www.vu.nl when the Web site uses a certificate signed by a legitimate certificate authority?
A stateless firewall blocks TCP connection initiation requests from an external location to any local host. Explain why this defense is not very effective against sophisticated attackers.
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