Security in Computer Networks

• Security Requirements
• Secret Key Encryption
• Secret Key: A Simple Example
• Block Encryption
• Cipher Block Chaining (CBC)
• Data Encryption Standard (DES)
• Advanced Encryption Standard (AES)
• Secret Key Encryption: Review
• Public Key Encryption
• Public Key Encryption
• Public Key Encryption Method
• Modular Arithmetic
• RSA Public Key Encryption
• RSA Algorithm: Example
• Confidentiality and Non-Repudiation
• Public Key Encryption: Review
• Hash, Signatures, Certificates
• Hash Functions
• MD5 Hash
• SHA-1 Algorithm
• Message Authentication Code (MAC)
• Digital Signature
• Digital Certificates
• Oligarchy Example
• Sample X.509 Certificate
• End Point Authentication
• Hashes, Signatures, Certificates
• Secure Email
• Secure E-Mail
• Signed Secure E-Mail
• Pretty Good Privacy (PGP)
• Lab 8: Secure e-mail
• Secure Email: Review
• Transport Layer Security (TLS)
• Web Traffic Security Approaches
• History
• SSL/TLS Architecture
• SSL/TLS Handshake Protocol
• SSL/TLS Handshake Protocol Actions
• Cryptographic Computations
• SSL/TLS Change Cipher Spec Protocol
• SSL/TLS Alert Protocol
• SSL/TLS Record Protocol Services
• SSL/TLS Record Protocol Operation
• Secure HTTP (HTTPS)
• TLS: Summary
• IP Security (IPsec) and VPNs
• IP Security
• IP Security Applications
• IP Security Architecture
• Security Association Database (SAD)
• Security Policy Database (SPD)
• IPsec
• Tunnel vs. Transport Mode
• Authentication Header (AH)
• Encapsulating Security Payload (ESP)
• IPsec Key Management (IKE)
• Summary: IPsec
• Firewalls and IDS
• What is a Firewall?
• Firewalls - Packet Filters
• Firewalls - Packet Filters
• Packet Filter Example: Windows Firewall
• Firewalls - Stateful Packet Filters
• Proxy Servers
• Application Level Gateway (Cont)
• DMZ Networks
• Firewall Limitations
• Intrusion vs. Extrusion Detection
• Types of IDS
• Honeypots
• Firewalls and IDS: Summary
• Ron's Cipher 4 (RC4)
• Extensible Authentication Protocol (EAP)
• RADIUS
• Wired Equivalent Privacy (WEP)
• Problems with WEP Authentication
• 802.11i Wireless LAN Security
• Authentication and Key Derivation
• WPA2 Four-Way Handshake
• Authentication and Key Management in 4G/5G
• Acronyms
• Summary

Presentation slides in Adobe Acrobat Format: 1 slide/page

View Slides+Video: ( Part 1*, Part 2*, Part 3*, Part 4*)
*WUSTL students, please watch the video on Canvas to get credit.

Right Click and save to download Slides+Video ( Part 1, Part 2, Part 3, Part 4 ) podcast.

Questions & Answers session: Revised Slides with Q&A.