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Cryptography and network Security Chapter 1

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Attacks ,Services and Mechanism

Engineering
1 of 14
Henric Johnson 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 Integrity Confidentiality Avalaibility
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 10
Henric Johnson 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.

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Cryptography and network Security Chapter 1

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