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Chapter 13 Network Security

Chapter 13 Network Security. Auditing Antivirus Firewalls Authentication Authorization Encryption. Security Policy Steps. Assets Threats Vulnerabilities Risk Protective measure Virus protection Firewall Authentication Encryption. Auditing. Personal: internal or external Methods

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Chapter 13 Network Security

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  1. Chapter 13Network Security • Auditing • Antivirus • Firewalls • Authentication • Authorization • Encryption

  2. Security Policy Steps • Assets • Threats • Vulnerabilities • Risk • Protective measure • Virus protection • Firewall • Authentication • Encryption

  3. Auditing • Personal: internal or external • Methods • Manual auditing: policy auditing or off-line audit (policy development & implementation) • automated auditing: event detection or real-time audits (software & exception reports) • Security probes: weak spots & improvement • Intrusion detection systems or Security Analyzer Tool for Analyzing Networks (SATAN) • Courtney

  4. Antivirus Technology • Virus scanning: signature scanners • Emulation technology: activity monitors (virtual PC) • CRC checkers: hashing checkers

  5. Firewall Architectures • Packet filtering • Application gateway

  6. Packet Filtering • Port-level filter, network-level filter, or packet filter • Filter tables: source and destination addresses • Weakness: IP spoofing

  7. Application Gateways • Application-level filters, assured pipe-lines, application gateways, or proxies • Sources, services or application • Weakness • I nability to detect malicious code

  8. Firewall Functions • Encryption • Virus scanning • Violation notification • Authentication • System monitoring • Auditing and logging • Attack protection

  9. Authentication • categories • What you know • What you have • What you are • Types • Token authentication • Biometric authentication

  10. Encryption methods • Private key encryption • Same algorithm • Data encryption standard (DES): 64-bit key • Public key encryption • Rivest-Shamir-Adelman: RSA • Public/private key encryption • Digital signature encryption • Private key, hashing program, original document

  11. Assignment • Review chapters 8, 9, & 13

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