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Network Security

Network Security. Henric Johnson Blekinge Institute of Technology, Sweden www.its.bth.se/staff/hjo/ henric.johnson@bth.se +46 708 250375. Outline. Attacks, services and mechanisms Security attacks Security services Methods of Defense A model for Internetwork Security

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Network Security

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  1. Network Security Henric Johnson Blekinge Institute of Technology, Sweden www.its.bth.se/staff/hjo/ henric.johnson@bth.se +46 708 250375 Henric Johnson

  2. Outline • Attacks, services and mechanisms • Security attacks • Security services • Methods of Defense • A model for Internetwork Security • Internet standards and RFCs Henric Johnson

  3. Attacks, Services and Mechanisms • Security Attack:Any action that compromises the security of information. • Security Mechanism:A mechanism that is designed to detect, prevent, or recover from a security attack. • 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. Henric Johnson

  4. Security Attacks Henric Johnson

  5. Security Attacks • Interruption: This is an attack on availability • Interception: This is an attack on confidentiality • Modfication: This is an attack on integtrity • Fabrication: This is an attack on authenticity Henric Johnson

  6. Security Goals Confidentiality Integrity Availability Henric Johnson

  7. Henric Johnson

  8. Security Services • Confidentiality (privacy) • Authentication (who created or sent the data) • Integrity (has not been altered) • Non-repudiation (the order is final) • Access control (prevent misuse of resources) • Availability (permanence, non-erasure) • Denial of Service Attacks • Virus that deletes files Henric Johnson

  9. Henric Johnson

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  11. 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 Henric Johnson

  12. Alternative architectures • Separate Layer • Over TCP: SSL • Over IP: IPSec • Application-Specific • SHTTP • Parallel • Kerberos; Kerberos with TLS? Henric Johnson

  13. IP Security Scenario Henric Johnson

  14. Architecture Application (HTTP) SSL TCP IP Henric Johnson

  15. Internet standards and RFCs • The Internet society • Internet Architecture Board (IAB) • Internet Engineering Task Force (IETF) • Internet Engineering Steering Group (IESG) Henric Johnson

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