Presentation on theme: "UNIT 6 DIGITAL LITERACY STUDY S3 OBJ 1 VIRUSES & DESTRUCTIVE PROGRAMS."— Presentation transcript:
UNIT 6 DIGITAL LITERACY STUDY S3 OBJ 1 VIRUSES & DESTRUCTIVE PROGRAMS
COMPUTER VIRUS A Virus is a computer program written to alter the way a computer operates without the permission or knowledge of the user. Viruses can either be considered a Nuisance or Destructive. They can Corrupt files Destroy data Display irritating messages Corrupt computer systems Some viruses replicate themselves which means that they copy themselves over and over.
TYPES OF VIRUSES Not all computer viruses behave, replicate, or infect the same way. There are several different categories of viruses and malware. Read the information and give a brief description in your own words of each type on your study guide.
TROJAN HORSE A Trojan horse, or Trojan, is a type of malware that masquerades as a legitimate file or helpful program with the ultimate purpose of granting a hacker unauthorized access to a computer.
WORM A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers. Often, it uses a computer network to spread itself.
BOOT SECTOR VIRUS Attaches itself to the first part of the hard disk that is read by the computer during the boot up process.
MACRO VIRUS Uses another application’s macro programming language to distribute themselves. They infect documents such as MS Word, Excel, etc.
MEMORY RESIDENT VIRUS Viruses that reside in a computers RAM. They stay in memory after its initiating program closes.
ROOTKIT VIRUS An undetectable virus which attempts to allow someone to gain control of a computer system. Disguised as operating system files.
POLYMORPHIC VIRUS Copies itself by creating multiple files of itself. It changes its signature making it hard for antivirus software to detect.
LOGIC BOMBS/TIME BOMBS Programmed to initiate at a specific date or when a specific event occurs.
SPREADING VIRUSES Viruses spread because people distribute infected files by exchanging disks and CDs, sending e-mail attachments, and downloading files from the Internet. Viruses attach themselves to files with.exe,.com, or.vbs filename extensions When you open the infected file, the virus opens and waits to infect the next program you run or disk you use. Viruses have the ability to lurk in a computer for days or months, quietly replicating (copying) themselves. You may not even know your computer has a virus, thus making it easier to spread the virus.
HOW VIRUSES SPREAD Click on the clipart below to discover 11 ways viruses are spread in our computer systems. Using a your own words, write a brief description of each on your study guide.
PROTECTING YOUR COMPUTER Just as you protect yourself from illness and disease, there are ways you can cut the chances of your computer systems being infected. Click on the clipart below to discover 11 suggestions for protecting your computer. List them on your study guide.
COMPUTER THEFT & PRIVACY The most popular tech item to steal are Laptops which are then most often sold. Theft of personal information can also be stolen through unsecured use of wireless services. Others may be able to access the files you have open in these situations.
PASSWORDS Use passwords to keep your files and information safe and to keep most people out of your files. Minimum of 8 characters Combination of uppercase letters, lowercase letters, numbers, and symbols No dictionary words – spelled backwards or forwards No personal information Use a different password for each system you access Change your passwords regularly
HACKING Hacking Hacking means finding out weaknesses in a computer or computer network, though the term can also refer to someone with an advanced understanding of computers and computer networks. Hackers may be motivated by a multitude of reasons, such as profit, protest, or challenge. Their objective is to do damage or steal personal information. The Penalty The federal punishment for hacking into computers ranges from a fine or imprisonment for no more than one year to a fine and imprisonment for no more than twenty years. This wide range of punishment depends upon the seriousness of the criminal activity and what damage the hacker has done. Hackers cost business money because of downtime and loss of data
INTERNET CONTROLS Types of controls for internet safety Firewalls: forms a barrier between two networks Filters: controls what can be viewed on Internet Parental Control: Software allows parental control over what kids do on the Internet Firewall LAN WAN
FREEWARE & SHAREWARE Freeware is copyrighted computer software which is made available for use free of charge for an unlimited time Shareware Software Is typically obtained free of charge, either by downloading from the Internet or other source. A user tries out the program, and thus shareware has also been known as "try before you buy". A shareware program is accompanied by a request for payment, and the software's distribution license often requires such a payment.
PLEASE COMPLETE THE ATTACHED ACTIVITY AS A HOMEWORK ASSIGNMENT. The end! Look for the Extra Credit Opportunity!