The document discusses network security terminology such as threats, attacks, risk analysis, and cryptography. It defines common threats like spoofing, tampering, repudiation, and denial-of-service attacks. The document also outlines the steps for performing risk analysis and includes an exercise asking questions about finding, removing, and preventing vulnerabilities.

1. Inam Ul Haq
MS Computer Science (Sweden)
Inam.bth@gmail.com, mr.inam.ulhaq@ieee.org
Discussion forum: questions.computingcage.com
Member of IEEE, ACM, Movement Disorder Society, PDF, BossMedia,
Michealjfox, Association for Information Systems and Internet Society.
Network Security
1 Network Security, University of Okara
Lecture 2: Terminologies

2. Table of Contents
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 Terminologies
 White Hacking
 Exercise

3. Terminologies
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 Threats
 Attacks
 Risk Analysis
 Dependability Overview
 Terms: Cipher, Cryptology, Cryptanalysis,
Cryptography
 Exercise

4. Threat
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 A risk of attack, or, chance of getting attacked.
 Attack: when a risk/treat is implemented.
 Omini-Present Security: more or less all
systems have security aspects that need to be
discussed. So Security Engineering deals with
ALL aspects of security.
 Example: ATM (placing metal to fool customers)

5. 4 Common Threats
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 Common threats in a computer setting include:
 Spoofing: the attacker pretends to be somebody
else
 Tampering with data: e.g. security settings are
changed to
give an attacker more privileges
 Repudiation: a user denies having performed an
action like
mounting an attack
 Denial-of-Service: DoS attacks can make for
instance web
sites temporarily unavailable

6. Risk Analysis
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1.Identify the assets to protect
2.Find the threats for each asset
3.Prioritize each of these risks
(asset x vulnerability x threat)
4.Implement controls for each risk, or accept it
5.Monitor the effectiveness of these controls and
reiterate

7. Network Security, University of Okara7

8. Network Security, University of Okara8

9. Exercise
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 How to find a vulnerability?
 How to remove a vulnerability?
 Windows XP (in 2002) = 35M LOC
 How to develop and exploit?
 How to prevent against exploits?