[Did you Know?] Lesson 1 : System Security

System Security

• means not only securing sensitive data against unauthorized access, but also protecting the integrity & existence of that data from malicious user of software.
  

Various System Security Threats

• Virus - A program or piece of code that is loaded onto your computer w/o your knowledge & runs against your wishes
  
  Types of Virus
  

  Boot Sector Virus:

  
  

  Companion Virus:

  
  

  File Infector Virus:

  
  

  Macro Virus:

  
  

  Memory Resident Virus:

  
  

  Polymorphic Virus:

  
  

  Metamorphic Virus:

  
  

  Stealth Virus:

  
  Files types that commonly carry Viruses
  
  
  
  • .exe    
    
  • .html    
    
  • .src (PC Screensaver)
    
  • .com    
    
  • .zip/.rar
    
  • .bat    
    
  • .dll
    
  • .vbs (visual basic)    
    
  • .xls (Microsoft Excel)
    
  •  .doc (Microsoft Word)  
    
  • .mdb (Microsoft Access)
    
  
  
  
  
  
• Trojan Horses - A Destructive Program that masquerades a benign application
  
  
• Logic / Time Bombs - A logic bomb / time bomb program will not activate until  a specific trigger, such as reaching a specific date or starting a program a specific number of time   set off.
  
  Example : You're an IT Programmer in your company and your boss is planning to kicked you out .   You can modify the database and put a virus which trigger if you're name  will be deleted in employees list (database)    
  
  
• Worms - A program or algorithm that replicates its self over a computer memory & usually performs malicious actions.
  
  
• Spyware - is a software w/c sends information to its creator about a users activities
  
  
• ADware - exist to advertise some commercial entity actively & w/o the user permission or awareness
  
  
• E-mail Spam -  are email message disguised as message from people , but one either advertising annoying or malicious in nature.
  

Now , we already how deadly or dangerous virus be.
How can we prevent them ?

To be Continued . !  
NEXT : [Did you Know?] Lesson 2 : TOP 10 List of Good Computer Security Practices

This Lesson are based on my copies / knowledge and what we discuss in our class  
no Copyright Infringement Intended