1. Northland Security Systems

2. Computer Viruses

3. Types of Viruses  Nuisance viruses  Data-destructive viruses  Espionage viruses  Hardware-destructive viruses  Nuisance viruses  Data-destructive viruses  Espionage viruses  Hardware-destructive viruses

4. Methods of Operation  Email viruses  Macro viruses  Boot sector viruses  Trojan horse viruses  Stealth viruses  Polymorphic viruses  Logic (time) bombs  Email 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 space available  A volume name has changed  Email message appears repeatedly  Files become corrupt  Program does not operate properly  Programs or files vanish  Strange messages appear on monitor  Less memory space available  A volume name has changed  Email message appears repeatedly

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