Review Session. Ennan Zhai
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1 Review Session Ennan Zhai
2 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
3 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
4 USENET & Gossip USENET format (RFC1036) Gossip protocol - Rumor-mongering; - Anti-entropy; - Security problem.
5 USENET & Gossip USENET format (RFC1036) Gossip protocol - Rumor-mongering; - Anti-entropy; - Security problem.
6 USENET & Gossip If Alice reads a message locally on her machine containing the above headers, what can you infer is the name of Alice s machine?
7 USENET & Gossip If Alice reads a message locally on her machine containing the above headers, what can you infer is the name of Alice s machine?
8 USENET & Gossip If Alice reads a message locally on her machine containing the above headers, what can you infer is the name of Alice s machine? cbosgd
9 USENET & Gossip Alice sends a private message to Jerry s USENET post, but Jerry did not receive it. After several days, Alice sees some new posts from Jerry with a Path: header line of cbosgd!mhuxj!ucbvax!eagle!jerry. What do you expect happened to Alice s original message to Jerry?
10 USENET & Gossip Alice sends a private message to Jerry s USENET post, but Jerry did not receive it. After several days, Alice sees some new posts from Jerry with a Path: header line of cbosgd!mhuxj!ucbvax!eagle!jerry. What do you expect happened to Alice s original message to Jerry?
11 USENET & Gossip Alice sends a private message to Jerry s USENET post, but Jerry did not receive it. After several days, Alice sees some new posts from Jerry with a Path: header line of cbosgd!mhuxj!ucbvax!eagle!jerry. What do you expect happened to Alice s original message to Jerry?
12 USENET & Gossip USENET format (RFC1036) Gossip protocol - Rumor-mongering; - Anti-entropy; - Security problem.
13 USENET & Gossip If you are operating a malicious peerster in our lab1 and you want to achieve an evil target, how you do that?
14 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
15 Firewalls & NATs NATs: - IP address. Firewall: - How it works; - Defending against bad guys or good guys? - Design.
16 Firewalls & NATs NATs: - IP address. Firewall: - How it works; - Defending against bad guys or good guys? - Design.
17 Firewalls & NATs A B
18 Firewalls & NATs A B
19 Firewalls & NATs A B
20 Firewalls & NATs NATs: - IP address. Firewall: - How it works; - Defending against bad guys or good guys? - Design.
21 Firewalls & NATs Internet set ffilter src-ip [ip-address] dst-ip [ip-address] icmp-protocol set ffilter src-ip dst-ip icmp-protocol
22 Firewalls & NATs Internet set ffilter src-ip dst-ip icmp-protocol set ffilter src-ip dst-ip icmp-protocol
23 Firewalls & NATs Internet set ffilter src-ip dst-ip icmp-protocol set ffilter src-ip dst-ip icmp-protocol
24 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
25 Cryptographic Tools Public/private key encryption/signature Diffle-Hellman key exchange Hash function
26 Cryptographic Tools Alice uploads a file foo.txt to the Internet and computes MD5 value for the file. After a few days, Alice downloads the file but finds the file is not the one she uploaded. Interestingly, the MD5 value is the same. What happened? How we can deal with this situation?
27 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
28 Reputation Systems Peer-based reputation systems: Object-based reputation systems: - Computing the reputation scores - Potential attacks
29 Reputation Systems Voter1 Voter File1-1 Voter2
30 Reputation Systems similarity? Voter1 Voter File1-1 Voter2
31 Reputation Systems Voter1 Voter3 Reputation? File1-1 Voter2
32 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
33 Unstructured Search Flooding Random walk More
34 Unstructured Search Running algorithm A. What s the traffic?
35 Today s Mission USENET & Gossip Firewall & NATs Cryptographic tools Reputation Unstructured search Structured search
36 Structured Search Chord - The algorithm; - Complexity. Attacks
37 Structured Search Three objects: 1, 2, and 6
38 Structured Search Three objects: 1, 2, and 6
39 Structured Search Three objects: 1, 2, and 6
40 Structured Search Three objects: 1, 2, and 6
41 Structured Search
42 Structured Search
43 Structured Search
44 Structured Search
45 Structured Search
46 Question 2 in Example
47 Question 2 in Example
48 Question 2 in Example
49 Question 2 in Example
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