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Northland Security Systems

Northland Security Systems. Computer Viruses. Types of Viruses. Nuisance Viruses Data-Destructive Viruses Espionage Viruses Hardware-Destructive Viruses. Methods of Operation. E-Mail Viruses Macro Viruses Boot Sector Viruses Trojan Horse Viruses Stealth Viruses Polymorphic Viruses

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Northland Security Systems

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  1. Northland Security Systems

  2. Computer Viruses

  3. Types of Viruses • Nuisance Viruses • Data-Destructive Viruses • Espionage Viruses • Hardware-Destructive Viruses

  4. Methods of Operation • E-Mail Viruses • Macro Viruses • Boot Sector Viruses • Trojan Horse Viruses • Stealth Viruses • Polymorphic Viruses • Logic (Time) Bombs

  5. Virus Symptoms • Files become corrupt • Program does not operate properly • Programs or files vanish • Strange messages appear on monitor • Less memory or disk space available • A disk or volume name has changed • E-mail message appears repeatedly

  6. Security Strategies • Data backup • Disaster recovery plan • Data encryption • User IDs and passwords • Biometric authentication • Network sniffers • Mini Webcams • Firewalls

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