Course Topics
Course Outline: Basic topics
Course Outline: Network Security
Course Objectives
Course Objectives
Text Books
Text Books
Text Books
Other Books
Occasional Assigned Reading
Main Themes of the Course
Main Themes of the Course
What This Course is Not About
What This Course is Not About
Peek at the Dark Side
Motivation
“Privacy and Security”
What Do You Think?
Desirable Security Properties
What Drives the Attackers?
Network Stack
Network Defenses … all defense mechanisms must work correctly and securely
Correctness versus Security
Bad News
Better News
Reading Assignment
Why study computer security?
Why study computer security?
What is cryptology?
Steganography
Cryptology and Security
Terminology Insecure Channel Plaintext Alice Encrypt Ciphertext C = E(P) Eve P = D(C) E must be invertible Decrypt Plaintext Bob
Cryptography
Alice and Bob Plaintext Alice Encrypt Ciphertext Decrypt Plaintext Bob
Substitution Cipher If every person on earth tried one per second, it would take 5 B years.
Monoalphabetic Cipher
Frequency Analysis
Pattern Analysis
Guessing
Guessing
Guessing
Guessing
Guessing
Monoalphabetic Cipher
Why was it so easy?
How to make it harder?
Network Security
Network Layer Vulnerabilities
IP Addresses
Other IP Addresses
Junctions
Special Networks
CIDR Addresses
IP Packet
IP Spoofing
IP Spoofing with Amplification
ICMP
Basic ICMP Message Types
ICMP Echo
Scans and Recon
Smurf Attack
Other Ping Abuse
Why Do You Need Pings?
About These Slides
Questions adeel. akram@uettaxila. edu. pk
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