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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 • Modification: This is an attack on integrity • Fabrication: This is an attack on authenticity Henric Johnson

  6. Security Goals Confidentiality Integrity Avalaibility Henric Johnson

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  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

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

  13. Internet RFC Publication Process Henric Johnson

  14. Recommended Reading • Pfleeger, C. Security in Computing. Prentice Hall, 1997. • Mel, H.X. Baker, D. Cryptography Decrypted. Addison Wesley, 2001. Henric Johnson

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