1. Security+ Guide to Network
Security Fundamentals, Third
Edition
Chapter 1
Introduction to Security

2. Objectives
• Describe the challenges of securing information
• Define information security and explain why it is
important
• Identify the types of attackers that are common
today
• List the basic steps of an attack
• Describe the five steps in a defense
• Explain the different types of information security
careers and how the Security+ certification can
enhance a security career
Security+ Guide to Network Security Fundamentals, Third Edition 2

3. Challenges of Securing Information
• There is no simple solution to securing information
• This can be seen through the different types of
attacks that users face today
– As well as the difficulties in defending against these
attacks
Security+ Guide to Network Security Fundamentals, Third Edition 3

4. Today’s Security Attacks
• Typical warnings:
– A malicious program was introduced at some point in
the manufacturing process of a popular brand of digital
photo frames
– Nigerian e-mail scam claimed to be sent from the U.N.
– “Booby-trapped” Web pages are growing at an
increasing rate
– A new worm disables Microsoft Windows Automatic
Updating and the Task Manager
– Apple has issued an update to address 25 security
flaws in its operating system OS X
Security+ Guide to Network Security Fundamentals, Third Edition 4

5. Today’s Security Attacks (continued)
• Typical warnings: (continued)
– The Anti-Phishing Working Group (APWG) reports that
the number of unique phishing sites continues to
increase
– Researchers at the University of Maryland attached
four computers equipped with weak passwords to the
Internet for 24 days to see what would happen
• These computers were hit by an intrusion attempt on
average once every 39 seconds
Security+ Guide to Network Security Fundamentals, Third Edition 5

6. Today’s Security Attacks (continued)
• Security statistics bear witness to the continual
success of attackers:
– TJX Companies, Inc. reported that over 45 million
customer credit card and debit card numbers were
stolen by attackers over an 18 month period from
2005 to 2007
– Table 1-1 lists some of the major security breaches
that occurred during a three-month period
– The total average cost of a data breach in 2007 was
$197 per record compromised
– A recent report revealed that of 24 federal government
agencies, the overall grade was only “C−”
Security+ Guide to Network Security Fundamentals, Third Edition 6

7. Security+ Guide to Network Security Fundamentals, Third Edition 7

8. Difficulties in Defending against
Attacks
• Difficulties include the following:
– Speed of attacks (now faced with zero-day attacks)
– Greater sophistication of attacks
– Simplicity of attack tools
– Attackers can detect vulnerabilities more quickly and
more readily exploit these vulnerabilities
– Delays in patching hardware and software products
– Most attacks are now distributed attacks, instead of
coming from only one source
– User confusion
Security+ Guide to Network Security Fundamentals, Third Edition 8

9. Security+ Guide to Network Security Fundamentals, Third Edition 9

10. Security+ Guide to Network Security Fundamentals, Third Edition 10

11. Difficulties in Defending against
Attacks (continued)
Security+ Guide to Network Security Fundamentals, Third Edition 11

12. What Is Information Security?
• Knowing why information security is important today
and who the attackers are is beneficial
Security+ Guide to Network Security Fundamentals, Third Edition 12

13. Defining Information Security
• Security can be considered as a state of freedom
from a danger or risk
– This state or condition of freedom exists because
protective measures are established and maintained
• Information security
– The tasks of guarding information that is in a digital
format
– Ensures that protective measures are properly
implemented
– Cannot completely prevent attacks or guarantee that
a system is totally secure
Security+ Guide to Network Security Fundamentals, Third Edition 13

14. Defining Information Security
(continued)
• Information security is intended to protect
information that has value to people and
organizations
– This value comes from the characteristics of the
information:
• Confidentiality
• Integrity
• Availability
• Information security is achieved through a
combination of three entities
Security+ Guide to Network Security Fundamentals, Third Edition 14

15. Security+ Guide to Network Security Fundamentals, Third Edition 15

16. Defining Information Security
(continued)
Security+ Guide to Network Security Fundamentals, Third Edition 16

17. Defining Information Security
(continued)
• A more comprehensive definition of
information security is:
– That which protects the integrity,
confidentiality, and availability (CIA)
of information on the devices that
store, manipulate (process), and
transmit the information through
products, people, and procedures
Security+ Guide to Network Security Fundamentals, Third Edition 17

18. Information Security Terminology
• Asset
– Something that has a value (examples?)
• Threat
– An event or object that may defeat the security
measures in place and result in a loss (examples?)
• Threat agent
– A person or thing that has the power to carry out a
threat (examples?)
• This definition is more broad than others that limit threat
agents to also possessing an intent to attack or damage
Security+ Guide to Network Security Fundamentals, Third Edition 18

19. Information Security Terminology
(continued)
• Vulnerability
– Weakness that allows a threat agent to bypass
security (i.e. configuration errors or software “bugs”)
• Risk
– The likelihood, or probability, that a threat agent will
exploit a vulnerability
– Risk is usually expressed as a percentage (90%
chance of a web server being hacked in a year)
– Realistically, risk cannot ever be entirely eliminated
Security+ Guide to Network Security Fundamentals, Third Edition 19

20. Information Security Terminology
(continued)
• Impact must then be calculated
– What is the resultant loss if the event occurs?

21. Information Security Terminology
(continued)
• Would the
Loss of
stereo really
be the threat
– or the
impact?
• If it is the
impact, what
then is the
threat?
• What if the
stereo was a
USB thumb
drive with
healthcare
records on
it?
Security+ Guide to Network Security Fundamentals, Third Edition 21

22. Information Security Terminology
Loss of USB Thumb Drive with PII Example
Asset Threat Threat Vulnerability Impact Mitigation
Agent
Security+ Guide to Network Security Fundamentals, Third Edition 22

23. Information Security Terminology
Loss of USB Thumb Drive with PII Example
Asset Threat Threat Vulnerability Impact Mitigation
Agent
Customer Loss or theft Employee or USBs are Loss of PII Enable encryption
Data of theif easily lost or results in on all drives
equipment misplaced. heavy fines (including USB
with data Data is in and loss of drives)
plain text on customer
the drives. confidence
(loss of
sales)
Security+ Guide to Network Security Fundamentals, Third Edition 23

24. Vulnerability Matrix

25. Understanding the Importance of
Information Security
• Preventing data theft
– Security is often associated with theft prevention
– The theft of data is one of the largest causes of
financial loss due to an attack
– Individuals are often victims of data thievery
• Thwarting identity theft
– Identity theft involves using someone’s personal
information to establish bank or credit card accounts
• Cards are then left unpaid, leaving the victim with the
debts and ruining their credit rating
Security+ Guide to Network Security Fundamentals, Third Edition 25

26. Understanding the Importance of
Information Security (continued)
• Avoiding legal consequences
– A number of federal and state laws have been
enacted to protect the privacy of electronic data
• The Health Insurance Portability and Accountability Act
of 1996 (HIPAA)
• The Sarbanes-Oxley Act of 2002 (Sarbox, or SOX)
• The Gramm-Leach-Bliley Act (GLBA)
• USA Patriot Act (2001)
• The California Database Security Breach Act (2003)
• Children’s Online Privacy Protection Act of 1998
(COPPA)
Security+ Guide to Network Security Fundamentals, Third Edition 26

27. Understanding the Importance of
Information Security (continued)
• Maintaining Productivity
– Cleaning up after an attack diverts resources such as
time and money away from normal activities
Security+ Guide to Network Security Fundamentals, Third Edition 27

28. Understanding the Importance of
Information Security (continued)
• Foiling cyberterrorism
– Cyberterrorism
• Attacks by terrorist groups using
computer technology and the
Internet
– Utility, telecommunications, and
financial services companies are
considered prime targets of
cyberterrorists
Security+ Guide to Network Security Fundamentals, Third Edition 28

29. Who Are the Attackers?
• The types of people behind computer attacks are
generally divided into several categories
– These include hackers, script kiddies, spies,
employees, cybercriminals, and cyberterrorists
Security+ Guide to Network Security Fundamentals, Third Edition 29

30. Hackers
• Hacker
– Generic sense: anyone who illegally
breaks into or attempts to break into a
computer system
– Narrow sense: a person who uses
advanced computer skills to attack
computers only to expose security flaws
• Although breaking into another person’s
computer system is illegal
– Some hackers believe it is ethical as long
as they do not commit theft, vandalism,
or breach any confidentiality
– Q: What is the difference between a
“Cracker” and a “Hacker”
– Q: What is the difference between White
hat hacking and black hat hacking?
– Q: What is “ethical hacking”?
Security+ Guide to Network Security Fundamentals, Third Edition 30

31. Script Kiddies
• Script kiddies
– Want to break into computers to create damage
– Unskilled users
– Download automated hacking software (scripts) from
Web sites and use it to break into computers
• They are sometimes considered more dangerous
than hackers
– Script kiddies tend to be computer users who have
almost unlimited amounts of leisure time, which they
can use to attack systems
Security+ Guide to Network Security Fundamentals, Third Edition 31

32. Spies
• Computer spy
– A person who has been hired to break into a
computer and steal information
• Spies are hired to attack a specific computer or
system that contains sensitive information
– Their goal is to break into that computer or
system and take the information without drawing
any attention to their actions
• Spies, like hackers, possess excellent computer
skills
Security+ Guide to Network Security Fundamentals, Third Edition 32

33. Employees
• One of the largest information security threats to a
business actually comes from its employees
• Reasons
– An employee might want to show the company a
weakness in their security
– Disgruntled employees may be intent on retaliating
against the company
– Industrial espionage
– Blackmailing
Security+ Guide to Network Security Fundamentals, Third Edition 33

34. Cybercriminals
• Cybercriminals
– A loose-knit network of attackers, identity thieves, and
financial fraudsters
– More highly motivated, less risk-averse, better
funded, and more tenacious than hackers
• Many security experts believe that cybercriminals
belong to organized gangs of young and mostly
Eastern European attackers
• Cybercriminals have a more focused goal that can
be summed up in a single word: money
Security+ Guide to Network Security Fundamentals, Third Edition 34

35. Cybercriminals (continued)
Security+ Guide to Network Security Fundamentals, Third Edition 35

36. Cybercriminals (continued)
• Cybercrime
– Targeted attacks against financial networks,
unauthorized access to information, and the theft of
personal information
• Financial cybercrime is often divided into two
categories
– Trafficking in stolen credit card numbers and financial
information
– Using spam to commit fraud
Security+ Guide to Network Security Fundamentals, Third Edition 36

37. Cyberterrorists
• Cyberterrorists
– Their motivation may be defined as ideology, or
attacking for the sake of their principles or beliefs
• Goals of a cyberattack:
– To deface electronic information and spread
misinformation and propaganda
– To deny service to legitimate computer users
– To commit unauthorized intrusions into systems and
networks that result in critical infrastructure outages
and corruption of vital data
Security+ Guide to Network Security Fundamentals, Third Edition 37

38. Attacks and Defenses
• Although there are a wide variety of attacks that can
be launched against a computer or network
– The same basic steps are used in most attacks
• Protecting computers against these steps in an
attack calls for five fundamental security principles
Security+ Guide to Network Security Fundamentals, Third Edition 38

39. Steps of an Attack
• The five steps that make up an attack
– Probe for information
– Penetrate any defenses
– Modify security settings
– Circulate to other systems
– Paralyze networks and devices
Security+ Guide to Network Security Fundamentals, Third Edition 39

40. Security+ Guide to Network Security Fundamentals, Third Edition 40

41. Defenses against Attacks
• Although multiple defenses may be necessary to
withstand an attack
– These defenses should be based on five fundamental
security principles:
• Protecting systems by layering
• Limiting
• Diversity
• Obscurity
• Simplicity
Security+ Guide to Network Security Fundamentals, Third Edition 41

42. Layering
• Information security must be created in layers
• One defense mechanism may be relatively easy for
an attacker to circumvent
– Instead, a security system must have layers, making
it unlikely that an attacker has the tools and skills to
break through all the layers of defenses
• A layered approach can also be useful in resisting a
variety of attacks
• Layered security provides the most comprehensive
protection
Security+ Guide to Network Security Fundamentals, Third Edition 42

43. Limiting
• Limiting access to information reduces the threat
against it
• Only those who must use data should have access
to it
– In addition, the amount of access granted to someone
should be limited to what that person needs to know
• Some ways to limit access are technology-based,
while others are procedural
Security+ Guide to Network Security Fundamentals, Third Edition 43

44. Diversity
• Layers must be different (diverse)
– If attackers penetrate one layer, they cannot use the
same techniques to break through all other layers
• Using diverse layers of defense means that
breaching one security layer does not compromise
the whole system
Security+ Guide to Network Security Fundamentals, Third Edition 44

45. Obscurity
• An example of obscurity would be not
revealing the type of computer, operating
system, software, and network connection a
computer uses
– An attacker who knows that information can
more easily determine the weaknesses of the
system to attack it
• Obscuring information can be an important
way to protect information
Security+ Guide to Network Security Fundamentals, Third Edition 45

46. Simplicity
• Information security is by its very nature complex
• Complex security systems can be hard to
understand, troubleshoot, and feel secure about
• As much as possible, a secure system should be
simple for those on the inside to understand and use
• Complex security schemes are often compromised
to make them easier for trusted users to work with
– Keeping a system simple from the inside but complex
on the outside can sometimes be difficult but reaps a
major benefit
Security+ Guide to Network Security Fundamentals, Third Edition 46

47. Surveying Information Security
Careers and the Security+ Certification
• Today, businesses and organizations require
employees and even prospective applicants
– To demonstrate that they are familiar with computer
security practices
• Many organizations use the CompTIA Security+
certification to verify security competency
Security+ Guide to Network Security Fundamentals, Third Edition 47

48. Types of Information Security Jobs
• Information assurance (IA)
– A superset of information security including security
issues that do not involve computers
– Covers a broader area than just basic technology
defense tools and tactics
– Also includes reliability, strategic risk management,
and corporate governance issues such as privacy,
compliance, audits, business continuity, and disaster
recovery
– Is interdisciplinary; individuals who are employed in it
may come from different fields of study
Security+ Guide to Network Security Fundamentals, Third Edition 48

49. Types of Information Security Jobs
(continued)
• Information security, also called computer security
– Involves the tools and tactics to defend against
computer attacks
– Does not include security issues that do not involve
computers
• Two broad categories of information security
positions
– Information security managerial position
– Information security technical position
Security+ Guide to Network Security Fundamentals, Third Edition 49

50. Security+ Guide to Network Security Fundamentals, Third Edition 50

51. CompTIA Security+ Certification
• The CompTIA Security+ (2008 Edition) Certification
is the premiere vendor-neutral credential
• The Security+ exam is an internationally recognized
validation of foundation-level security skills and
knowledge
– Used by organizations and security professionals
around the world
• The skills and knowledge measured by the
Security+ exam are derived from an industry-wide
Job Task Analysis (JTA)
Security+ Guide to Network Security Fundamentals, Third Edition 51

52. CompTIA Security+ Certification
(continued)
• The six domains covered by the Security+ exam:
– Systems Security, Network Infrastructure, Access
Control, Assessments and Audits, Cryptography, and
Organizational Security
Security+ Guide to Network Security Fundamentals, Third Edition 52

53. Other Stuff
• Join Organizations and get certified:
– ISSA – Student Memberships $30
www.issa.org
– IAPP – student memberships $50,
become CIPP/G certified
– Start a computer club at NVCC (participate in
the CCDC!!!)
– ISC2 – Associate of (ISC)² - pass SSCP exam
www.isc2.org
• Read Books and Magazines:
• Hackin9
• 2600 Magazine
• Everything else you can get your hands on
• Pay attention to your personal life and
activities so you can get a security clearance,
companies and agencies DO NOT hire
hackers

54. You are a part of CyberWatch!!!

55. IAPP
• SEEKING PRIVACY SCHOLARS
Each year, the IAPP awards Privacy Academy scholarships
to outstanding college students who may be interested in
entering the field of privacy and data protection. Up to five
students will receive scholarships to attend this year's
Privacy Academy, which takes place in Baltimore, MD, next
month. Do you know of a motivated full-time college student
who would like the chance to attend, learn, network and
have one-on-one time with a professional mentor? If so,
please let them know about this valuable opportunity.
Interested candidates should send a resume and letter of
interest to scholarships@privacyassociation.org

56. Summary
• Attacks against information security have grown
exponentially in recent years
• There are several reasons why it is difficult to defend
against today’s attacks
• Information security may be defined as that which
protects the integrity, confidentiality, and availability of
information on the devices that store, manipulate,
and transmit the information through products,
people, and procedures
Security+ Guide to Network Security Fundamentals, Third Edition 56

57. Summary (continued)
• The main goals of information security are to prevent
data theft, thwart identity theft, avoid the legal
consequences of not securing information, maintain
productivity, and foil cyberterrorism
• The types of people behind computer attacks are
generally divided into several categories
• There are five general steps that make up an attack:
probe for information, penetrate any defenses, modify
security settings, circulate to other systems, and
paralyze networks and devices
Security+ Guide to Network Security Fundamentals, Third Edition 57

58. Summary (continued)
• The demand for IT professionals who know how to
secure networks and computers from attacks is at an
all-time high
Security+ Guide to Network Security Fundamentals, Third Edition 58