1 Network Security Ola Flygt Växjö University +46 470 70 86 49.

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Presentation transcript:

1 Network Security Ola Flygt Växjö University

2 Outline  Attacks, services and mechanisms  Security attacks  Security services  Methods of Defence  Models for Internetwork Security  Internet standards and RFCs

3 Security  “When we know our surroundings and have tools to protect ourselves, we can feel more secure.”  “It makes me feel secure to be around my dog. He will always warn me if something is wrong.”  “Knowing someone is looking out for me is what security means to me.”  “If we did not have security, our world would be a very bad place.” (“What Security Means To Me” essays at

4 Information Security

5 The Security Landscape  IT realm  Physical realm  Airport  Food security, etc.  Political realm  International etc.  Monetary realm  Financial, etc.

6 The IT Security Landscape  Computing security  Data security  Application security  Information security  Network security

7 Attacks, Services and Mechanisms  Security Attack: Any action that compromises the security of information.  Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms.  Security Mechanism: A mechanism that is designed to detect, prevent, or recover from a security attack.

8 Security Attacks

9  Interruption: This is an attack on availability  Interception: This is an attack on confidentiality  Modification: This is an attack on integrity  Fabrication: This is an attack on authenticity

10 Security Goals Integrity Confidentiality Availability

11 Threats and Attacks  Threat: A potential for violation of security, which exists when there is a circumstance, capability,action, or event that could breach security and cause harm. That is, a threat is a possible danger that might exploit a vulnerability.  Attack: An assault on system security that derives from an intelligent threat; that is, an intelligent act that is a deliberate attempt (especially in the sense of a method or technique) to evade security services and violate the security policy of a system.

12

13 Security Services (X.800)  Confidentiality (privacy)  Authentication (who created or sent the data)  Integrity (has not been altered)  Non-repudiation (you can not deny sending or receiving some information)  Access control (prevent misuse of resources)  Availability (permanence, non-erasure)  Denial of Service Attacks  Virus that deletes files

14 Security Service vs Attack

15 Security Mechanisms (X.800)  Encipherment  Digital Signature  Access Control  Authentication Exchange  Traffic Padding And more…..

16 Service vs Mechanisms

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19 Methods of Defence  Encryption  Software Controls (access limitations in a data base, in operating system protect each user from other users)  Hardware Controls (smartcard)  Policies (frequent changes of passwords)  Physical Controls

20 Internet standards and RFCs  The Internet society  Internet Architecture Board (IAB)  Internet Engineering Task Force (IETF)  Internet Engineering Steering Group (IESG)

21 Internet RFC Publication Process