Chapter1-security - q spyware malware can record keystrokes...

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Introduction Chapter 1: roadmap 1.1 what is the Internet? 1.2 network edge § end systems, access networks, links 1.3 network core § packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history 1-109
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Introduction Network security q field of network security: v how bad guys can attack computer networks v how we can defend networks against attacks v how to design architectures that are immune to attacks q Internet not originally designed with (much) security in mind v original vision: a group of mutually trusting users attached to a transparent network J v Internet protocol designers playing catch-up v security considerations in all layers! 1-110
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Introduction Bad guys: put malware into hosts via Internet q malware can get in host from: v virus: self-replicating infection by receiving/executing object (e.g., e-mail attachment) v worm: self-replicating infection by passively receiving object that gets itself executed
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Unformatted text preview: q spyware malware can record keystrokes, web sites visited, upload info to collection site q infected host can be enrolled in botnet, used for spam. DDoS attacks 1-111 Introduction target Denial of Service (DoS): attackers make resources (server, bandwidth) unavailable to legitimate traffic by overwhelming resource with bogus traffic 1. select target 2. break into hosts around the network (see botnet) 3. send packets to target from compromised hosts Bad guys: attack server, network infrastructure 1-112 Introduction Bad guys can sniff packets packet “ sniffing ” : v broadcast media (shared ethernet, wireless) v promiscuous network interface reads/records all packets (e.g., including passwords!) passing by A B C src:B dest:A payload v wireshark software used for end-of-chapter labs is a (free) packet-sniffer 1-113 Introduction Bad guys can use fake addresses IP spoofing: send packet with false source address A B C src:B dest:A payload 1-114 … lots more on security (throughout, Chapter 8)...
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