Chapter 1

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Chapter 1

  1. 1. Network Security Henric JohnsonBlekinge Institute of Technology, Sweden www.its.bth.se/staff/hjo/ henric.johnson@bth.se +46 708 250375 Henric Johnson 1
  2. 2. Outline• Attacks, services and mechanisms• Security attacks• Security services• Methods of Defense• A model for Internetwork Security• Internet standards and RFCs Henric Johnson 2
  3. 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 3
  4. 4. Security Attacks Henric Johnson 4
  5. 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 5
  6. 6. Security Goals ConfidentialityIntegrity Avalaibility Henric Johnson 6
  7. 7. Henric Johnson 7
  8. 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 8
  9. 9. Henric Johnson 9
  10. 10. Henric Johnson 10
  11. 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 11
  12. 12. Internet standards and RFCs• The Internet society – Internet Architecture Board (IAB) – Internet Engineering Task Force (IETF) – Internet Engineering Steering Group (IESG) Henric Johnson 12
  13. 13. Internet RFC Publication Process Henric Johnson 13
  14. 14. Recommended Reading• Pfleeger, C. Security in Computing. Prentice Hall, 1997.• Mel, H.X. Baker, D. Cryptography Decrypted. Addison Wesley, 2001. Henric Johnson 14

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