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Network Security Henric Johnson Blekinge Institute of Technology, Sweden www.its.bth.se/staff/hjo/ henric.johnson@bth.se +46 708 250375 Henric Johnson 1
Outline • Attacks, services and mechanisms • Security attacks • Security services • Methods of Defense • A model for Internetwork Security • Internet standards and RFCs Henric Johnson 2
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
Security Attacks Henric Johnson 4
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
Security Goals Confidentiality Integrity Avalaibility Henric Johnson 6
Henric Johnson 7
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
Henric Johnson 9
Henric Johnson 10
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
Internet standards and RFCs • The Internet society – Internet Architecture Board (IAB) – Internet Engineering Task Force (IETF) – Internet Engineering Steering Group (IESG) Henric Johnson 12
Internet RFC Publication Process Henric Johnson 13
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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Chapter 1

  • 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 1
  • 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. 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. Security Attacks Henric Johnson 4
  • 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. Security Goals Confidentiality Integrity Avalaibility Henric Johnson 6
  • 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
  • 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. 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. Internet RFC Publication Process Henric Johnson 13
  • 14. Recommended Reading • Pfleeger, C. Security in Computing. Prentice Hall, 1997. • Mel, H.X. Baker, D. Cryptography Decrypted. Addison Wesley, 2001. Henric Johnson 14