Information Security

• Mechanism to ensure that none of the threats, applicable to a scenario, apply.
• Techniques
  • Authorization
    • “Should you be doing that?”
  • Authentication
    • “Who are you?”
  • Cryptography

Threat Perception and Cost of Security

• Securing a system has three components
  • Prevention, intrusion detection and recovery
• Each system has its own cost.
• Security techniques may not be easy to use
• Cost of securing a system must match the threat perception and value of information.