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  1. 1. COMPUTER SECURITYLESSON 16COMPUTER SECURITYDEFINITION OF COMPUTER SECURITYComputer security means protecting ourcomputer systems and the information theycontain against unwanted access, damage,destruction or modification.We need to protect our computer from anyintruders such as hackers, crackers and scriptkiddie.We do not want strangers to read our e-mail, use our computer toattack other systems, send forged e-mail from our computer, or examinepersonal information stored on our computer such as financial statements.TYPES OF COMPUTER SECURITYThree types of computer security are:a) hardware securityb) software security/data securityc) network securitya) HARDWARE SECURITYHardware security refers to security measures usedto protect the hardware specifically the computerand its related documents.The examples of security measures used to protectthe hardware include PC-locks, keyboard-locks,smart cards and biometric devices.b) SOFTWARE AND DATA SECURITYSoftware and data security refers to the securitymeasures used to protect the software and the lossof data files.Examples of security measures used to protect thesoftware are activation code and serial number.40
  2. 2. An example of security measure used to protect the loss of data files is thedisaster recovery plan method. The idea of this plan is to store data,program and other important documents in a safe place that will not beaffected by any major destruction.c) NETWORK SECURITYThe transfer of data through network has become acommon practice and the need to implementnetwork security has become significant.Network security refers to security measures usedto protect the network system. One example ofnetwork security measures is firewall. With firewall, network resources canbe protected from the outsiders.PERSONAL COMPUTER SECURITY CHECKLISTIn order to make sure our computers are secured, here are the computersecurity checklist to follow. Do not eat, drink or smoke near the computer Do not place the computer near open windows or doors Do not subject the computer to extreme temperatures Clean the equipment regularly Place a cable lock on the computer Use a surge protector Store disks properly in a locked container Maintain backup copies of all files Stores copies of critical files off sites Scan a floppy disk before you open it Do not open any unknown email receivedLESSON 17INTRODUCTION COMPUTER THREATSThe computer is a great tool to store important information. In certaincases, the information is very vital that losing it will harm the computersystem.Computer threats can come from many ways either from human or naturaldisasters. For example, when someone is stealing your account informationfrom a trusted bank, this threat is considered as a human threat. However,when your computer is soaked in heavy rain, then that is a natural disasterthreat.MALICIOUS CODE41
  3. 3. Malicious code is also known as a rogue program. It isa threat to computing assets by causing undesiredeffects in the programmer’s part. The effect is causedby an agent, with the intention to cause damage.The agent for malicious code is the writer of the code,or any person who causes its distribution. There arevarious kinds of malicious code. They include virus, Trojan horse, logic door,trapdoor and backdoor, worm and many others.a) VIRUS• a program that can pass on the maliciouscode to other programs by modifying them• attaches itself to the program, usually fileswith .doc, .xls and .exe extensions• destroys or co-exists with the program• can overtake the entire computing system and spread to othersystemsb) TROJAN HORSE• a program which can perform useful andunexpected action• must be installed by users or intrudersbefore it can affect the system’s assets• an example of a Trojan horse is the login script that requests forusers’ login ID and password• the information is then used for malicious purposesc) LOGIC BOMB42
  4. 4. • logic bomb is a malicious code that goes off when a specificcondition occurs.• an example of a logic bomb is the time bomb• it goes off and causes threats at a specified time or datee) TRAPDOOR OR BACKDOOR• a feature in a program that allowssomeone to access the program withspecial privilegesf) WORM• a program that copies and spreads itselfthrough a networkPrimary Differences Between Worms And virusesHACKERHacking is a source of threat to security in computer.WormOperates through the networkSpreads copies of itself as astandalone programVirusSpreads through any mediumSpreads copies of itself as aprogram that attaches to otherprogramsIt is defined as unauthorised access to the computersystem by a hacker.Hackers are persons who learn about the computer system in detail. Theywrite program referred to as hacks. Hackers may use a modem or cable tohack the targeted computers.NATURAL AND ENVIRONMENTAL THREATSComputers are also threatened by natural or environmental disaster. Be it athome, stores, offices and also automobiles.Examples of natural andenvironmental disasters: Flood Fire Earthquakes, storms and tornados Excessive Heat Inadequate Power Supply43
  5. 5. THEFTTwo types of computer theft:1) Computer is used to steal money, goods,information and resources.2) Stealing of computer, especially notebook andPDAs.Three approaches to prevent theft:1) prevent access by using locks, smart-card orpassword2) prevent portability by restricting the hardwarefrom being moved3) detect and guard all exits and record anyhardware transportedLESSON 1844
  6. 6. SECURITY MEASURESToday, people rely on computers to create, store and manage criticalinformation. It is important that the computer and the data they store areaccessible and available when needed. It is also important that users takemeasures to protect their computers and data from lost, damage andmisused.Security measures mean the precautionary measures taken toward possibledanger or damage. There are 6 type of security measures.1) DATA BACKUPData Backup is a program of file duplication. Backupsof data applications are necessary so that they canbe recovered in case of an emergency.Depending on the importance of the information,daily, weekly or biweekly backups from a hard diskcan be performed.2) CRYPTOGRAPHY45
  7. 7. Cryptography is a process of hiding information by altering the actualinformation into different representation, for example, an APA can bewritten as I? X.Almost all cryptosystems depend on a key such as apassword like the numbers or a phrase that can be used to encrypt ordecrypt a message.The traditional type of cryptosystem used on a computer network is called asymmetric secret key system.3) ANTIVIRUSAn antivirus program protects a computer againstviruses by identifying and removing any computerviruses found in the computer memory, onstorage media or incoming e-mail files.An antivirus program scans for programs thatattempt to modify the boot program, the operatingsystem and other programs that normally are read from but not modified.IDENTIFYING VIRUSTwo technique are used to identify the virus.VIRUS SIGNATUREAlso called a virus definition is aspecific pattern of the virus code.INOCULATING A PROGRAM FILEThe antivirus program recordsinformation such as the file size and filecreation date in a separate inoculationfile.The antivirus program then uses thisinformation to detect if a virus tamperswith the data describing the inoculatedprogram file.If an antivirus program identifies an infected file, it attempts to remove itsvirus, worm or Trojan horse. If the antivirus program cannot remove theinfection, it often quarantines the infected file. Quarantine is a separatearea of a hard disk that holds the infected file until the infection can beremoved. This step ensures other files will not become infected. Patents forinventions Utility, design or plant patents that protect inventions andimprovements to existing inventions4) ANTI-SPYWARESpyware is a program placed on a computer withoutthe user’s knowledge. It secretly collects informationabout the user.46
  8. 8. The spyware program communicates information tothe outside source.An anti-spyware application program sometime called tracking software or aspybot is used to remove spyware.Among of the popular anti-spyware programs are:• Spybot Search and Destroy• Ad-aware• Spyware Blaster5) FIREWALLFirewall is a piece of hardware or software whichfunctions in a networked environment to prevent somecommunications forbidden by the securitypolicy.Firewall implement a security policy. It might permitlimited access from in or outside the networkperimeters or from certain user or for certain activities.6) HUMAN ASPECTS OF SECURITY MEASURESHuman aspects refer to the user and also the intruderof a computer system.It is one of the hardest aspects to give protection to.47
  9. 9. The most common problem is the lack of achieving a good informationsecurity procedure.LESSON 19RELATIONSHIP BETWEEN SECURITY THREATS ANDSECURITY MEASURESSecurity threats may come from in many forms. For example, whensomeone is invading your account information from a trusted bank, this actis considered as a security threat.Security measures can be used to prevent this invaderfrom getting the account information. For example, thebank can use a firewall to prevent unauthorised access toits database.SECURITY THREADSSecurity threats may come from in many forms. For example, whensomeone is invading your account information from a trusted bank, this actis considered as a security threat.Security measures can be used to prevent this invader from getting theaccount information. For example, the bank can use a firewall to preventunauthorised access to its database.MALICIOUS CODE THREATS VS. ANTIVIRUS ANDANTI-SPYWARESecurity threats include virus, Trojan horse, logic bomb, trapdoor andbackdoor, and worm.48
  10. 10. Antivirus and anti-spyware can be used to protect the computer from thethreats by: limiting connectivity allowing only authorised media for loading data and software enforcing mandatory access controls blocking the virus from the computer programHACKING VS. FIREWALLHacking is an unauthorised access to the computersystem done by a hacker. We can use firewall orcryptography to prevent the hacker from accessingour computers.A firewall permits limited access to unauthorisedusers or any activities from the network environment. Cryptography is aprocess of hiding information by changing the actual information intodifferent representation, for example, an APA can be written as 7&*.NATURAL DISASTER VS. DATA BACKUPThe natural and environmental disasters may include:• flood• fire• earthquakes• storms• tornadosNatural disasters may threaten a computer’s hardware and software easily.Computers are also sensitive to their operating environment such asexcessive heat or the inadequacy of power supply.The backup system is needed to backup all data and applications in thecomputer. With the backup system, data can be recovered in case of anemergency.THEFT VS. HUMAN ASPECTSComputer theft can be of two kinds: can be used to steal money, goods,information and computer resources the actual stealing of computers, especiallynotebooks and PDAsMeasures that can be taken to prevent theft: prevent access by using locks, smart-card or password prevent portability by restricting the hardware from being moved detect and guard all exits and record any hardware transported49
  11. 11. BE SUPSPICIOUS OF ALL RESULTSThere are many instances where non-programmersdevelop applications which are not built with properunderstanding of software engineering practices.Data produced by such applications may not becorrect and may risk corrupting data received fromother sources that are not compatible with theapplication.LESSON 20SECURITY PROCEDURESComputers should have alarm systems to guard them from any attacks suchas viruses and data corruption. The alarm system is the security measuresthat we take to ensure its safety.DATA PROTECTIONWe need to protect the data in the computer as itmay somehow get lost or corrupted due to someviruses or mishap like fire, flood, lightning, machinefailures and even human errors.There are a few ways to protect the information namely:• make backup files• detect the virus and clean the computer• warn others on virus attacks1) BACKUP FILESUsers can do backups of file systems by: keeping the duplicated files in external storagesuch as in the floppy disk and thumb drive do backup frequently2) DETECT VIRUS AND DO CLEANUPA computer virus is able to affect and infect the waythe computer works. Viruses can be detected whenwe run an antivirus program.We can also delete theinfected files and documents.3) WARN OTHERS ON VIRUSATTACKWe can warn others on virus attacks or new virusesby sending e-mails to them.50
  12. 12. DETECTING ILLEGAL ACCESS TO SYSTEMSThe computer system is able to detect any illegal access to the system by auser who does not have any authorisation. Basically, a corporation willsimply use tcpwrappers and tripwire to detect any illegal access to theirsystem. Users access will be reviewed periodically by computer operations.On going internal audits will be made to ensure detection of violations ofsecurity and unauthorised modifications to software and data .TCPWRAPPERSTcpwrappers stop the attempted connectionexamines its configuration fileswill decide whether to accept or reject the request.Tcpwrappers will control access at the application level, rather than at thesocket level like iptables and ipchains. The system will run tcpwrappers tolog access to ftp, tftp, rch, rlogin, rexec and telnet.TRIPWIRETripwire will detect and report on any changes in thethousands of strategic system files.The system will run tripwire to determine if systemfiles have changed.PREVENTING ILLEGAL ACCESS TO SYSTEMSHave any of you ever been to an airport? Do you know the do’s and don’tswhen you are at the airport?There are things that cannot be taken inside the airplane. It is for thepurpose of security procedures.It is the same as computer systems. It would not allow any unauthorisedusers to simply access the system.Ways to prevent illegal access to systems:1. Run anlpassword to make password cracking difficult.2. Run tcpwrappers to check if the name for an ip address can beprovided by DNC3. Use a callback system to prevent unauthorised use of stolenpasswords.51
  13. 13. PREVENTING ILLEGAL ROOT ACCESSTo prevent any illegal root access, we should haveSudo, so that people can perform on some machinewithout getting access to the entire root if that is notrequired. In addition, with Sudo we did not have togive out the root password.Sudo stands for (Superuser do) and is a program in Unix, Linux and similaroperating systems such as Mac OS X that allows users to run programs inthe form of another user (normally in the form of the systems superuser).Sudo allows a permitted user to execute a command as the superuser oranother user, as specified in the sudoers file.PATCHPatch supplies small updates to software, providedthat the source code is available.Patch is a name of an UNIX utility. It applies a scriptgenerated by the different program to a set of filesthat allows changes from one file to be directlyapplied to another file.Resources are not enough to patch all security holes that we hear aboutthrough the bugtraq list.(Bugtraq is a full disclosure mailing list dedicated to the issues of computersecurity. On-topic discussions are new discussions about vulnerabilities,methods of exploitation and how to fix them. It is a high volumemailing list and almost all new vulnerabilities are discussed there.)LESSON 21COMPUTER APPLICATIONS IN THE SOCIETYThe computer has change the society today as much as industrial revolutionchanged society in 18thand 19thcentury. People interacts directly withcomputer in education, finance, government, health care, science,publishing, tourism, and industry.Computers help them to do their work faster and more efficient by using thesoftware application that consist of special program for specific task.52
  14. 14. SOFTWARE APPLICATIONSSoftware applications are used for many reasons. Such as to enhance thelearning process, to help in business activities, to assist the graphics andmultimedia project and to fasilitate communication.AreaHome andEducationBusinessGraphicsand MultimediaExamples of software applicationsIntegrated software, Personal finance, Legal, TaxPreparation,Clip Art/Image Gallery, Home Design/Landscaping andReferenceWord Processing, Spreadsheet, Database, PresentationGraphics, Personal Information Manager, Software Suite,Project Management and AccountingComputer-aided design (CAD), Desktop Publishing,Paint/Image Editing, Video and Audio Editing, MultimediaAuthoring and Web Page AuthoringCommunication E-mail, Web Browsers, Chat Rooms, Newsgroups, InstantMessaging, Groupware and Video ConferencingThese software application comes in packages.SOFTWARE APPLICATIONS PACKAGES53
  15. 15. Software ApplicationWord ProcessingSpreadsheetDatabasePresentation GraphicsPersonal InformationManagerSoftware SuiteProject ManagementAccountingExamples of Popular PackagesMicrosoft Word and Lotus Word ProMicrosoft Excel and Lotus 1-2-3Microsoft Access and Microsoft Visual FoxProMicrosoft Power Point and Lotus FreelanceGraphicsMicrosoft Outlook and Palm DesktopMicrosoft Office and Lotus SmartSuiteMicrosoft Project and Corel CATALYSTMYOB and Peachtree Complete AccountingHOME AND EDUCATIONToday, computers are used in schools, colleges anduniversities in order to promote better education byusing computers. In the labs, students use softwarepackages to complete their assignments. At thesame time, some educators use the computer-basedtraining and web-based training as replacements forlecture presentation.Some of the software applications that are usually used in schools anduniversities include Microsoft Office, Adobe Photoshop, Macromedia Flash,AutoCAD, Macromedia Dreamweaver and Macromedia Director.COMPUTERS FOR HIGHER EDUCATIONOpen Distance Learning (ODL) or online learning canbe implemented as computers are the main medium indelivering the knowledge from one location to theother locations.This type of learning consists of online forum,discussion, quizzes, test questions and many more.The example of the Open Distance Learning institution is the Open Universityof Malaysia ( use finance or accounting software to balance check books, pay bills,track personal income and expenses, manage investments and evaluatetheir financial plans.Accounting software helps companies to record and report their financialtransactions. Examples of these software applications include MYOB, IntuitQuick Books and Peachtree Complete Accounting.COMPUTERS IN BANKING54
  16. 16. In the banking sector, many financial institutions offer online banking.People can access their financial records from anywhere in the world. Oneexample of online banking is Maybank2u. ( of the packages on banking offer a variety of online services. Whichrequires access to the web.For example we can track our investment online, compare insurance ratesand do online banking.INDUSTRYBy using the CAM system, computers record actuallabour, material, machine and computer time used tomanufacture a particular product.Computers process this data and automatically updateinventory, production, payroll and accounting recordson the company’s network.Examples of companies using this system are Proton( Perodua ( AND MULTIMEDIAComputers are crucial in publishing especially in theprocess of making works available to the public.These works include magazines, books, newspapers,music and film production.Special software applications are used to assist graphic designers to developgraphics, texts, photographs and composing songs.Computer-Aided Design, Desktop Publishing, Paint/Image Editing, Video andAudio Editing and Multimedia Authoring are among the popular applicationssoftware.COMMUNICATIONA government provides society with direction bymaking and administering policies. Most governmentoffices or agencies have websites in order to providecitizens with up-to-date or latest information.Examples of software applications used forcommunication include e-mail, web browsers,newsgroups, instant messaging and video conferencing.People can access government websites to: check information on taxes ( apply for permits and licenses (
  17. 17.  check for MyKad ( pay parking tickets and check summons ( renew vehicle registration ( register online for IPTA/IPTS application ( IN TOURISMToday, people will go online to get all relatedinformation about traveling. They can visit websites toget information on destinations, prices, hotels, flightsand car rentals.They can also purchase ticket online, all payments canbe made by using credit card.COMPUTERS IN THE HEALTHCAREIn the medical field, computers are very important inrunning the operations. Medical staffs use computersfor various purposes, namely:• maintaining patient records• monitoring patients’ vital sign• assisting doctors, nurses and technicians with medical tests by usingcomputer and computerised devices .• using medical software to help with researching and diagnosing healthconditions.Furthermore, computers and the internet are important sources for people toget all information on medical, nutrition, fitness and other tips from severalavailable websites. The latest development in the medical field istelemedicine. This technology is meant to help professional to conduct liveconference in separate locations around the globe.SCIENCEIn the scientific world, computers are used in allfields of science from biology to astronomy tometeorology and others. These are things thatcan be done by computers, namely: collecting, analyzing and modelling data serving as medium of communication with colleagues around the world contributing to new inventions or breakthrough in surgery, medicineand treatment imitating functions of the central nervous system, retina of the eyeand others by tiny computers allowing a deaf person to listen through cochlear implantLESSON 22COMPUTER USERSPeople around the world rely on computers to do so many things. They arefrom different backgrounds and are divided in 5 categories.56
  18. 18. HOME USERThe computer is a basic necessity. Each home userspends time on the computer for different reasons: business communication entertainment educationSMALL OFFICE/HOME OFFICE (SOHO) USERSOHO users use computer to manage their work effectively. They advertisetheir products and services throughwebsites. They also take orders from thewebsites.To save cost, SOHO connects one printerto many employees to share. SOHO alsohave their own basic business softwaresuch as word processing and spreadsheet software to assist them indocuments preparation and their financial tasks.Small Office or Home Office users include: accounting firms, travel agencies, florists and many moreThese SOHO users: use desktop or notebook computers as well as telephone, handphonesand PDAs in completing their tasks and communicating work in a small company or work as an individual at homeMOBILE USERNetwork services are expanding to serve peopleacross the country and the world. More users arebecoming mobile users, who work on computer whilethey are away from their home or main offices.Mobile users:57
  19. 19.  include real estate agents, insurance agents, meter readers andjournalists use notebook computers, Internet-enabled PDAs or smart phones work with basic business software such as word processing andspreadsheet business software use presentation graphics software to create and deliver presentationsto a large audience by connecting a mobile computer or device to a videoprojectorPOWER USERPower users require the capabilities of workstationcomputers or other types powerful computers. Thesoftware that is used by power users is normallyexpensive because of their specialize design. Theircomputer have network access connections andinternet connections.Power users: include engineers, scientists, architects and virtual reality animators use computers with extremely fast processor, bigger storage andcustomised software work with mini computers that uses design to meet the organisationalneeds use software such as CAD, CAM and MATLABExamples :LARGE BUSINESS USEREach employee or customer who uses computer inlarge offices of company is a large business user.Large business users use a large network ofcomputers. Use computers for basic business activitiessuch as preparing bills for millions of customers,preparing payroll and managing thousands of items inthe inventory.Large business users: bank, insurance company, hypermarket use computers for basic business activities have e-commerce that allow customers and vendors to interact and dobusiness transactions online therefore customers, vendors and otherinterested parties can access information on the web have e-mail and web browsers to enable communications amongemployees, vendors and customers provide kiosks in public locationsMany employees of large business telecommute, which means they workaway from their offices workstation. They also have flexible schedule.CURRENT AND58
  20. 20. FUTURE DEVELOPMENTLESSON 23HOW TO CONDUCT A STUDYThere are five basic steps to follow when we do a study.1. Get an overview of your topic.2. Narrow down the topic and form some specificquestions related to it.3. Find study materials related to the topic.4. Evaluate study materials5. Write out study papers and cite sourcesExamples of the terms usually used in a study. compare: to examine similarities or differences define: to provide clear and concise meaning discuss: to examine in detail and present arguments for andagainst explain: to tell how things work or come to be the way they areSTEP 1 - GET AN OVERVIEW OF THE TOPICFamiliarityWe need to familiarise ourselves with the topic before westart doing a study. This will allow us to spend more timedeveloping a topic rather than using more time learningabout the topic.We also have to get a broader picture of the subject byfocusing on the who, when, why, how and where questions.ReferenceRefer to a dictionary, encyclopedia, handbook, textbook, guide orbibliography which can provide an overview of the topic.BrainstormingSpend some time brainstorming about the topic and write down everythingthat we can think of about the topic.STEP 2 - NARROW DOWN THE TOPICNarrow down the topic by reading the sources andform some specific questions related to the topic. Bydoing this, we may have awareness of the variousaspects that we may want to study. However we needto understand that not all information is reliable andwe have to differentiate between facts and opinions.Objective Information based on facts which can be verified59
  21. 21.  presents results of original study often the view from experts in the subject area presents analysis of facts from all sides of issueSubjective Information based on what seems to be true reflects personal views or judgment often the views of individuals or groups may present an analysis of the facts from one side of an issueSTEP 3 - FIND STUDY MATERIALSStudy materials are available offline and online. Wecan search for the information that we want in books,journals, articles or other resource materials found inthe library and the Internet.A list of all the books, journals and electronicmaterials are available from the library. We can usethe online databases to find the most useful materials for our study.STEP 4 - EVALUATE STUDY MATERIALSAll selected materials need to be evaluated in four aspects:AspectsRelevanceSampleDoes this publication help to answer the researchquestion?If it does not find something else which does.Reliability/Credibility is the information accurate?has the information been peer reviewed?are the authors and publishers reputable?do they cite their credentials?are there footnotes and a bibliography?PerspectiveUpdateis this a primary source (presenting the authors ownresearch and ideas) or a secondary source(summarising and discussing the research and ideasof others)?is the evident biased? Does the author attempt tosway the readers opinion?how recent is the information published?how recent has it been updated?have there been new developments on the topic?could the information you are using be misleadingbecause of the publication date?STEP 5 - WRITING OUT THE STUDY PAPERWhen all resources are gathered, start writing the paper and cite all thesources of information used. These may include books, journals, articles andmagazines.60
  22. 22. LESSON 24PRESENTING RESULTA presentation should contain three well-defined sections, they are:1. Introduction is at the beginning of the research includes the objectives of the research provides a clear statement on why the study was undertaken includes the limitations/assumptions and analytical techniques2. Content consists of facts or arguments related to subject matter can be presented in an argument format or just as an overview3. Conclusion is a review of content (not repetition of content) relates to the statement of objectives in the introduction should not introduce new issues should contain judgment or decision that has been reachedBASIC NEEDS OF A GOOD STUDY PAPERThere are a variety of ways to write out your research. However, there is aset of basic requirements that must be followed when it comes to submittingor presenting written presentation.1. General Points number all pages use one side of A4 paper secure all pages with a staple (top left-hand corner) don’t use paper clips/pins or folders must be typed/word processed clear and easy to read print-out spell check your paper supply an estimated word count on the cover sheet include your name, course name and teacher’s name2. Style double-spaced 12 point minimum and 14 point maximum (with the exception ofheadings and footnotes) 2 spaces after a full stop and 1 space following a comma, semi-colon or colon no abbreviation such as ‘e.g.’, ‘&’ or ‘etc.’ unless it is included ina bracket. Write everything in full: ‘for example’, ‘that is’, ‘andso on’. numerals are used when the number is more than two words;for tabulation; statistical discussion; sums of money; addresses;61
  23. 23. dates; time; and page, chapter, volume numbers (for example,2 June, 2000) consistency in style for example in writing out headings3. Quote a direct quote must be placed in quotation block quotes are used if a direct quote is more than three lineslong. if possible, paraphrase information in preference to using directquotes. use quotes and paraphrasing to support argument4. Clarity helps your readers understand your paper by organizing yourpaper well and don’t forget to insert the page numbers edit your work means reading through the paper several timesbefore submission and don’t just rely on the rough spelling andgrammar checks offered by your software.5. Indicating your intentions in a complex study, the introduction of every section shouldinform the reader what to expect in that section should containjudgment or decision that has been reached. the final paragraph in each section should tie the contents ofthat section together with a short conclusion. do not use too many words to say what you are going to do andwhat you have done, keep to the necessary minimumPREPARING A PRESENTATIONLESSON 25DELEGATION OF WORK62
  24. 24. WHAT IS DELEGATION?Delegation is the ability to assign tasks to otherswith the authority, responsibility and accountabilityto finish the tasks. This means it is not enough tojust give out orders to people but as a team leaderyou also need to give specific instructions on what todo. Tell your team members that they areresponsible for the task given to them and explain tothem what would happen to the project if they failedto finish the task.WHY DELEGATE TASKS?Reasons why should I delegate tasks: will be able to save time help others to learn new skills, for example, how to negotiate andcooperate utilise individuals additional strengths and expertise will be able to achieve large goals by dividing them into smaller tasks promotes creativity and diversity because others may have better waydoing things cut down on tasks that can be done just as well by othersWHAT TO DELEGATE?In order to complete a team project, you will be asked to use your skills inresearch, presentation and task delegation. When working on a large projectyou must know what task to delegate and how to assign them.1. Questioning Discover a problem Form a question to answer the problem2. Planning63
  25. 25.  Set out steps to find answers Select sources for possible answers Plan a basic draft for reporting Assign tasks to team members Agree on contingency plans3. Gathering Go to agreed sources of information Collect information4. Sorting Put similar information together Highlight valuable credible information5. Synthesizing Discuss information with others Combine different information6. Evaluating Discusses if the information gathered supports the answer Test out solution and decision that supports the answer7. Reporting Write or type out the report Create an appropriate graphic or media Prepare for Q & A Prepare researchEXAMPLES OF TASK DELEGATIONScenarios“The head librarian wants us to finish thework by the end of the day, which is about 5pm.”“We have to sort out these books accordingto their subjects. Remember to stick thecorrect book codes onto the books.”“I will teach you the coding system.”“Chong, you take the science books andIndra, you take the art books.”“I don’t know the coding system.”“So, is everybody clear on what needs tobe done and when we should meet againlater.”LESSON 26TOPICS FOR STUDY64Good TechniquesSet clear task deadline.Describe in detail the taskobjective.Help team member toperform task if needed.Delegate task to thosequalified to do the job.Inform limitation of abilitiesor resource to other teammembers.Monitor task progress.
  26. 26. In order to do the research, you need to follow this 5 steps.STUDY TOPICSForm into groups. Discuss with the team members and choose ONE (1) ofthe study topics below:1. Copyright and piracy from a moral and legal standpoint.2. Credit card fraud on the Internet and its implications on the industry/economy/government.3. Malaysian Cyber Law, Electronic Government Law.The portfolio will contain:1. Team journal study project introduction page minutes of team meetings initial project plan/calendar conflict resolution report2. Initial framework for presentation3. Final presentationThe purpose of team journal is to keep track the progress of the project.The team’s initial framework is where the team should do some basic studyon the topic and decide what should be included in the presentation.65
  27. 27. The print out of the final presentation will be given to the teacher for finalgrading.SOURCE CITATION CARDSource citation card is a note card in which you write the name of thearticle, author, book name, page numbers, where you found it, why it isgood information and a short summary of the important points.CREATING YOUR PRESENTATIONA presentation should: have at least 15 slides (not including the Title slide) have a Title slide- introduce presentation- include names of each member of the team use any design templates use at least 5 graphics (e.g.: clip art, photographs, word art anddrawings) have some multimedia- use animation on slides (be careful of very noisy ones!)- use slide transitions use less text on the slides- try presenting the information through pictures, graphs, mindmaps or any other form of visual (as oppose to textual)presentation have a citation slide- the last slide must list all of your citations and other relatedresources (where you got the content)- remember to give credit to others!THE FINAL PRESENTATION66
  28. 28. Guidelines: each team member must speak during the presentation. each team will have 10 minutes to present. presenters should face the audience and not just read from the screenor paper.Tips: practice in advance. prepare notes on paper or cue cards to help you remember what youneed to say during the presentation. remember to speak out clearly for people at the back to hear you. do not shout!SYSTEM CONCEPTLESSON 27OVERVIEW OF COMPUTER SYSTEM67
  29. 29. These devices are examples of computer hardware. A computer systemneeds to have these hardware to function.COMPUTER SYSTEMA computer system is defined as combination of components designed toprocess data and store files.A computer system consists of four major hardware components; inputdevices, output devices, processor and storage devices.A computer system requires hardware, software and a user to fully function.Software refers to set of instructions that tell the hardware what to do.Software can also have various other functions such as performingcomputation, communication with other software and human interaction.User refers to a person who uses the computer for any purposes such aswork, business and entertainment.COMPUTER HARDWAREComputer hardware consists of: input devices processor output devices storage devicesInput DevicesInput devices feed data or commands in a form that the computer can use.Example of input devices are: Keyboard Light Pen Joystick Microphone Mouse Video Digital camera.68
  30. 30. ProcessorThe CPU is an example of a processor. It has thesame important as the brain to human being.Output DevicesOutput devices such as the monitor showspeople the process data or information. Thistype of information can be understood and useby computer user. Other example of outputdevices are: Printer Plotter SpeakerStorage DevicesStorage usually means secondary storage. Itconsists secondary storage devices such ashardisk, Floppy Disk, diskette, CD ROM and DVDROM.COMPUTER SOFTWAREThere a 2 types of computer software, system software and applicationsoftware. System software is any computer software that helps to runcomputer system. System software controls, integrate and manages theindividual component of a computer system.LESSON 28INTRODUCTION TO COMPUTER SYSTEM69
  31. 31. COMPUTER HARDWARE BLOCK DIAGRAMAn Input device feed raw data to the processor. A processor processes rawdata and turns it into useful information. A storage device keeps or storesboth process and unprocess data for later usage. An output device shows ordisplay the processed data.INPUT DEVICESWhen data is entered into the computer system, it is called an input. Inputcomes in various forms; texts, graphics, audio and video. Input devices areneeded to input data into the computer system.Keyboard, mouse, scanner, barcode reader and digital camera are someexample of input devices.OUTPUT DEVICESOutput is the result of raw input data that has beenprocessed by the central processing unit intomeaningful information. Common forms of outputare texts, numbers, graphics, sounds, animationsand videos.The most common output devices arecomputer screens, speakers and printers.STORAGE DEVICES70
  32. 32. The system’s primary storage, Random Access Memory (RAM) can only holddata temporarily. Thus, secondary storage is needed to provide additionalstorage. The data stored in the secondary storage is considered permanentuntil it is deleted or removed.Secondary storage can be magnetic disks and optical disks. Examples ofsecondary storage are hard disks, rewritable CDs and DVDs as well asremovable disks such as pen drives.PERIPHERAL DEVICESExternal hardware devices attached to thecomputer are called peripheral equipments.LESSON 29INFORMATION PROCESSING CYCLEDo you know how a computer works? We use the computer in our everydaylives but not all of us know how this machine operates.Human uses the brain to think, make decisions and process information. Acomputer has a brain too, and the brain of a computer is the processor orthe central processing unit (CPU) that processes information.THE CENTRAL PROCESSING UNITThe central processing unit or the CPU is the brain of the computer.All processing activities are done in the CPU. Itutilises the computer memory to execute instructionsfrom the application software and accomplish a task.For example: editing a letter, drawing a picture andsorting numbers.The processor must be connected to input devices, output devices andstorage devices to carry out the above mentioned tasks.THE INFORMATION PROCESSING CYCLE71
  33. 33. User will input the data to be processed by the processor.The storage holds databases, files and programs. The output devicespresent the processed data as useful information products for the user.INPUTInput is any data or instructions that we enter into the computer system forprocessing.There are some common ways of feeding input datainto the system, which are:• typing on a keyboard• pointing with a mouseCPU accepts instruction from the user and translates the instruction intoreadable information (decode).PROCESSThe processing unit controls all activities within the system. For everyinstruction, the control unit repeats a set of four basic operations called themachine cycle:72
  34. 34. Fetchingthe process of obtaining a program instructions or data item from memory.Decodingthe process of translating a program instruction into signals that thecomputer can execute.Executingthe process of implementing the instructions in a program.Storingthe process of writing the result to the storage or memory.STORAGEStorage is a location which data, instruction andinformation are held for future use. Every computeruses storage to hold system software and applicationsoftware.When we issue a command to start the applicationsoftware, the operating system locates the program instorage and loads it into memory.A storage medium, also called secondary storage is the physical material inthe computer that keeps data, instruction and information.A storage device is the computer hardware that records or retrieves items toand from storage media.OUTPUT73
  35. 35. Output is data that has been processed into a usefulform, called information. There are four types ofoutput, which are texts, graphics, audio and video.The text consists of characters that are used tocreate texts, sentences and paragraphs.Graphics are digital representations of non text information such asdrawings, charts and photographs.Audio is music, speech or any other sound. Video consists of images thatprovide the appearance of full motion.LESSON 30DATA REPRESENTATIONBINARY DIGITComputers recognize only two discretestates: on and off. These states can berepresented by two digits, 0 and 1. Each 0or 1 is called a bit in the binary system.Bit is the smallest unit of data a computercan process. Bit is a short for binary digit.The binary system has a base of 2 withthe two digits (0 and 1). Combinations of0s and 1s represent larger numbers.BITA bit is the smallest unit of data that thecomputer can process. Bit is a short for binarydigit. A bit is represented by the numbers 1and 0. These numbers represent the binarysystem. They correspond to the states of onand off, true and false, or yes and no.All digital data use the binary system to process the information. Thisinformation include letters, digits or special character.BYTEByte is a unit of information built from bits. One byte is equals to 8 bits.Eight bits that are grouped together as a unit. A byte provides enoughdifferent combinations of 0s and 1s to represent 256 individual characters.One byte represents a single character such as the number 3, letter b74
  36. 36. or a $ symbol. Bits and bytes are the basis for representing all meaningfulinformation and programs on computers.CHARACTER8 bits = 1 byteOne byte represents one character such as A, 7, 9 and +.Eight bits that aregrouped together as a unit. A byte provides enough different combinationsof 0s and 1s to represent 256 individual characters.For example, the capital letter F is represented by the binary code 01000110that can be understood by the computer system. Eight bits grouped togetheras a unit are called a byte. A byte represents a single character in thecomputer.CHARACTER CODESThere are three character codes to representcharacters which are ASCII, EBCDIC and Unicode.Each byte contains eight bits. A byte provides enoughdifferent combination of 0s and 1s to represent 256characters.The combinations of 0s and 1s are defined by patterns. These patterns arecalled coding scheme. The 256-character capability of ASCII and EBCDIC istoo small to handle the characters that are used by other languages such asArabic, Japanese and Chinese.The Unicode coding scheme is designed to solve this problem. It uses twobytes (16 bits) to represent one character. Unicode will have more than65,000 different characters. This can cover all the world’s languages.LESSON 31INTRODUCTION TO BINARY CODINGCOMMUNICATION CODESSmoke signals, Morse code and semaphore are some of the communicationcodes used by people in the early days. In the information digital era, peoplesend information via electronic devices such as through the computers.75
  37. 37. Computers use binary codes to communicate. One of the widely used binarycodes is the American Standard Code for Information Interchange(ASCII).HISTORY OF CHARACTER CODESBefore people used binary codes such as ASCII to communicate viacomputers, character codes were widely used as a medium ofcommunication. Let’s look at some of the character codes used prior to theuse of ASCII.76
  38. 38. WHAT IS ASCII?77
  39. 39. ASCII pronounced as "ask-key" stands for the American Standard Code forInformation Interchange and was proposed by ASA (American StandardAssociation) in 963 and was finalised in 1968.ASCII is a standard of 7-bitcode used to represent characters, which include letters, numbers andpunctuation marks.7 bits allow the computer to encode a total of 128 characters for thenumbers 0-9, uppercase and lowercase letters A-Z and a few punctuationsymbols. However this 128 bit code only suitable for english languagespeaking users.IBM and Apple expanded the amount of space reserved for the charactercodes to 8-bits, equivalent to 1 byte.FUNCTIONS OF ASCIIASCII was established to achieve compatibilitybetween various types of data processingequipment making it possible for thecomponents to communicate with each othersuccessfully.ASCII enables manufacturers to produce components that are assured tooperate correctly in a computer.ASCII makes it possible for humans to interact with a computer. It alsoenables users to purchase components that are compatible with theircomputer configurations.78
  40. 40. HOW ASCII WORKS IN A COMPUTER SYSTEM?When you press a key, for example the letter D onyour keyboard, the electronic signal is sent to the CPUfor the computer to process and store in memory.Every character is converted to its correspondingbinary form. The computer the processes the letter asa byte., which actually a series of on and off ofelectrical states. When the computer is finishedprocessing the byte, the software installed in the system convert the byteback which is then displayed in the screen. In this example, the letter D isconverted to 01000100.LESSON 32DATA MEASUREMENTWhy is 1024 bytes = 1KB?KILOBYTE (KB) 20= 1In mathematics, 1 KB = 1000 bytes. 21= 2In computer, 1 KB = 1024 bytes or 22= 4can be said as: 23= 824= 161 KB = 210bytes 25= 3226= 64This is how we get the calculation for 1024bytes.MEGABYTE (MB)1 MB = 1 048 576 bytes or it can be said as:1 MB = 220bytesGIGABYTE (GB)1 GB = 1 073 741 824 bytes or it can be said as:1 GB = 230bytesTERABYTE (TB)1 TB = 1 099 511 627 776 bytes or it can be said as:1 TB = 240bytesLESSON 33CLOCK SPEED MEASUREMENT7927= 12828= 25629= 512210= 1024
  41. 41. EVOLUTION OF COMMUNICATIONWhen people talk about a computer’s “speed”, theymean how fast it can process data. In other words,this means the speed the computer can turn data intoinformation.Every microprocessor contains a system clock. The system clock controls thespeed of all the operations within a computer. The speed of the clock ismeasured by how many cycles per second the clock makes.HERTZ AND SECONDSThe clock speed unit is measured in hertz. A hertz is one cycle per second.MEGAHERTZ (MHz)Mega is a prefix that stands for million. Thus, megahertz (MHz) equals toone million cycles of the system clock. A computer that operates at 933 MHz(megahertz) has 933 million clock cycles in one second.GIGAHERTZ (GHz)Giga is a prefix that stands for billion.Gigahertz (GHz) equals to one billioncycles of the system clock.In relation with megahertz,1.0 GHz is equivalentto 1000 MHz.For example, a microprocessor that runs at 200 GHz executes 200 billioncycles per second. This is what they are talking about if they say a computeris a 2.4 GHz machine. Its clock rate is 2.4 billion cycles per second.GHz is most often used as a measurement of a PC processor chip and power,with bigger numbers meaning more speed and higher price.80
  42. 42. PROCESSING SPEEDThe system clock is one of the major factors thatinfluence the computer speed. A CPU with a higherclock speed can process more instructions per secondthan a CPU with a lower clock speed. For example, a1 GHz CPU is faster than a CPU operating at 800 MHz.The speed of the system clock affects only the CPU. Ithas no effect on peripherals such as a printer or diskdrive.MICROPROCESSOR SPEEDOne way of comparing the performance of personal computers is bycomparing their microprocessor speeds. Microprocessor speeds aredetermined by their clock speed and are usually expressed in gigahertz(GHz), billion of machine cycles per second.For example, a personal computer that is listed at 2.2 GHz has a processorcapable of handling 2.2 billion machine cycles per second. A top speedpersonal computer can be much faster, with newer ones exceeding 3.0 GHz.Direct comparison of clock is meaningful between identical microprocessor.Thus, it is accurate to say that a Pentium 4 running at 2.4 GHz isapproximately one-third faster than a Pentium 4 running at 1.8 GHz.SPEED AND PATHThe combination of speed and number of paths determines the totalprocessing speed or channel bandwidth. This is because different processorsoften use different architectures. For this reason, a 1.4 GHz Pentium 4performs better than a 1.4 GHz Pentium 3, but it is not as fast as a 1.4 GHzPower PC G4 processor.81