About the Presentations
• The presentations cover the objectives found in the opening of each chapter.
• All chapter objectives are listed in the beginning of each presentation.
• You may customize the presentations to fit your class needs.
• Some figures from the chapters are included. A complete set of images from the book can be found on the Instructor Resources disc.
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Security+ Guide to Network Security Fundamentals, Third
Edition
Chapter 1Introduction to Security
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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
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Objectives (continued)
• 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
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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
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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
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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
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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−”
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Difficulties in Defending against Attacks
• Difficulties include the following:– Speed of 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
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Difficulties in Defending against Attacks (continued)
What Is Information Security?
• Knowing why information security is important today and who the attackers are is beneficial
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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
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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
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Defining Information Security (continued)
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Defining Information Security (continued)
• A more comprehensive definition of information security is:– 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
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Information Security Terminology
• Asset– Something that has a value
• Threat– An event or object that may defeat the security
measures in place and result in a loss
• Threat agent– A person or thing that has the power to carry out a
threat
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Information Security Terminology (continued)
• Vulnerability– Weakness that allows a threat agent to bypass
security
• Risk– The likelihood that a threat agent will exploit a
vulnerability– Realistically, risk cannot ever be entirely eliminated
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Information Security Terminology (continued)
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Information Security Terminology (continued)
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
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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)
• 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)
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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
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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
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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
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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
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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
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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
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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
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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
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Cybercriminals (continued)
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
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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
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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
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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
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Probe for Information• To probe the system for any information that can be
used to attack it
• “reconnaissance” is essential to provide information• Type of hardware
• Version of software or firmware
• Personal information about the users
• Probing for information include ping sweeps of the network to determine if a system response
• Port scanning to see what ports may be open
• Queries that send failure messages back to a system
• Password quessing39
Penetrate any Defenses
• Once a potential system has been identified and information is gathered the next step;
• Is to launch the attack to penetrate the defenses
• Manipulating or breaking a password
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Modify Security Settings
• Modifying the security settings is the next step after the system has been penetrated
• Allows the attacker to re-enter the compromised system more easily
• They are known as privilege escalation tools (there are many programs that help accomplish this task)
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Circulate to other Systems
• Once the system has been compromised;
• The attacker then uses it as a base to attack other networks and systems
• Same tools that are used to probe for information are then directed toward other systems
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Paralyze Networks and Devices
• Attacker can choose to damage the infected computer or network
• Deleting or modifying files, stealing valuable data
• Crashing the computer or
• Performing denial of service attack
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Internet Control Message Protocolernet
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
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Layering• Let’s read pg 20 (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
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Limiting
• Let’s read pg. 21
• 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
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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
• A jewel thief, might be able to foil the security camera by dressing in black clothes but should not be able to use the same technique to trick the motion detection system
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Obscurity
• Let’s read pg. 22
• 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
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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
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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
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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
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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
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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)
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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
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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
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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
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Summary (continued)
• The demand for IT professionals who know how to secure networks and computers from attacks is at an all-time high
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