INTRODUCTION TO NETWORK SECURITY

2 THREATS AND VULNURABILITIES

NETWORK SECURITY DEVICES AND TECHNOLOGIES

NETWORK TRAFFIC ANALYSIS

CRYPTOGRAPHY AND NETWORK SECURITY

NETWORK SECURITY ANALYSIS AND FORENSIC

SECURING WIRELESS NETWORKS

ADVANCED TOPICS IN NETWORK SECURITY

Confidentiality, Integrity, and Availability (CIA triad)

Confidentiality

Ensuring that information is only accessible to authorized users or systems.

  • Goal: Prevent unauthorized access or disclosure of sensitive data.
  • Techniques:
    • Encryption (e.g., AES, RSA)
    • Access control mechanisms (e.g., role-based access control)
    • Multi-factor authentication (MFA)
    • Data classification and handling policies
  • Example: Securing customer credit card information in an online transaction.

Integrity

Ensuring that information remains accurate, consistent, and unaltered unless authorized.

  • Goal: Prevent unauthorized modification, deletion, or tampering of data.
  • Techniques:
    • Hashing algorithms (e.g., SHA-256) to verify data integrity
    • Digital signatures
    • Checksums and parity checks
    • Version control and auditing mechanisms
  • Example: Ensuring that a financial transaction is not altered during transmission.

Availability

Ensuring that authorized users have reliable and timely access to systems and data.

  • Goal: Prevent disruptions or outages that affect usability.
  • Techniques:
    • Redundant systems and backups
    • Distributed Denial of Service (DDoS) protection
    • Regular system maintenance and updates
    • Disaster recovery planning
  • Example: Keeping an e-commerce website operational during a peak shopping period.