1. Madison 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