Understanding Anti-Virus Software

What does anti-virus software do?

Although details may vary between packages, anti-virus software scans files or your computer’s memory for certain patterns that may indicate an infection. The patterns it looks for are based on the signatures, or definitions, of known viruses. Virus authors are continually releasing new and updated viruses, so it is important that you have the latest definitions installed on your computer.

Once you have installed an anti-virus package, you should scan your entire computer periodically.

    • saving and scanning email attachments or web downloads rather than selecting the option to open them directly from the source
    • scanning media, including CDs and DVDs, for viruses before opening any of the files
  • Automatic scans – Depending what software you choose, you may be able to configure it to automatically scan specific files or directories and prompt you at set intervals to perform complete scans.
  • Manual scans – It is also a good idea to manually scan files you receive from an outside source before opening them. This includes

What happens if the software finds a virus?

Each package has its own method of response when it locates a virus, and the response may differ according to whether the software locates the virus during an automatic or a manual scan. Sometimes the software will produce a dialog box alerting you that it has found a virus and asking whether you want it to “clean” the file (to remove the virus). In other cases, the software may attempt to remove the virus without asking you first. When you select an anti-virus package, familiarize yourself with its features so you know what to expect.

Which software should you use?

There are many vendors who produce anti-virus software, and deciding which one to choose can be confusing. All anti-virus software performs the same function, so your decision may be driven by recommendations, particular features, availability, or price.

Installing any anti-virus software, regardless of which package you choose, increases your level of protection. Be careful, though, of email messages claiming to include anti-virus software. These messages, supposedly from your ISP’s technical support department, contain an attachment that claims to be anti-virus software. However, the attachment itself is in fact a virus, so you could become infected by opening it.

How do you get the current virus information?

This process may differ depending what product you choose, so find out what your anti-virus software requires. Many anti-virus packages include an option to automatically receive updated virus definitions. Because new information is added frequently, it is a good idea to take advantage of this option. Resist believing email chain letters that claim that a well-known anti-virus vendor has recently detected the “worst virus in history” that will destroy your computer’s hard drive.  You can confirm virus information through your anti-virus vendor or through resources offered by other anti-virus vendors.

While installing anti-virus software is one of the easiest and most effective ways to protect your computer, it has its limitations. Because it relies on signatures, anti-virus software can only detect viruses that have signatures installed on your computer, so it is important to keep these signatures up to date.

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Create strong passwords

Strong passwords are important protections to help you have safer online transactions.

Keys to password strength: length and complexity

An ideal password is long and has letters, punctuation, symbols, and numbers.

  • Whenever possible, use at least 14 characters or more.
  • The greater the variety of characters in your password, the better.
  • Use the entire keyboard, not just the letters and characters you use or see most often.

Create a strong password you can remember

There are many ways to create a long, complex password. Here is one way that may make remembering it easier:

What to do Suggestion Example
Start with a sentence or two (about 10 words total). Think of something meaningful to you. Long and complex passwords are safest. I keep mine secret. (10 words)
Turn your sentences into a row of letters. Use the first letter of each word. lacpasikms (10 characters)
Add complexity. Make only the letters in the first half of the alphabet uppercase. lACpAsIKMs (10 characters)
Add length with numbers. Put two numbers that are meaningful to you between the two sentences. lACpAs56IKMs (12 characters)
Add length with punctuation. Put a punctuation mark at the beginning. ?lACpAs56IKMs (13 characters)
Add length with symbols. Put a symbol at the end. ?lACpAs56IKMs” (14 characters)

Test your password with a password checker

A password checker evaluates your password’s strength automatically.

Protect your passwords from prying eyes

  • The easiest way to “remember” passwords is to write them down.
    It is okay to write passwords down, but keep them secure.

Common password pitfalls to avoid

Cyber criminals use sophisticated tools that can rapidly decipher passwords.

Avoid creating passwords using:

  • Dictionary words in any language.
    Words in all languages are vulnerable.
  • Words spelled backwards, common misspellings, and abbreviations.
    Words in all languages are vulnerable.
  • Sequences or repeated characters.
    Examples: 12345678, 222222, abcdefg, or adjacent letters on your keyboard (qwerty).
  • Personal information.
    Your name, birthday, driver’s license, passport number, or similar information.
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Defining viruses, worms, hoaxes, Trojans, and security vulnerabilities

Defining viruses, worms, hoaxes, Trojans, and security vulnerabilities

There are thousands of different viruses and damaging software programs that can harm your computer or make it perform slower. Typically, these software programs are the following:
  • Hoax – An e-mail that usually states that it is harming the computer, but does not actually do what it says. Some hoaxes ask the reader of the e-mail to perform a damaging process, such as deleting an important file. Most hoaxes are spread by people who do not know that the e-mail is a hoax and who are hoping to alert others to a potential virus.
  • Phishing – Methods used to try to and move people browsing the Internet to a malicious Web site. When a person visits the Web site, the Internet browser tries to read malformed code on the page and induces a security hole or the Web page itself is designed to look similar to another popular Web page (to collect credit card or other personal information).
  • Security Vulnerability – A weakness in software that allows unwanted activity inside the operating system.
  • Trojan or Trojan Horse – A software program usually created to make a computer less secure. The software usually looks similar to a useful file that a person would want to open. The payload of a Trojan is usually delivered when the file opens and usually has devastating results. Trojans are often used to create back-doors (a program that allows outside access into a secure network). Trojans are most often delivered as an e-mail attachment or through security vulnerabilities while browsing the Internet.
  • Virus – A software program that copies itself into another program, a hidden space on a drive, or items that support scripts. Most viruses copy only themselves, while a minority unleash a payload – actions caused by the virus. Payloads can damage files, deliver Trojan files, corrupt hard drives, display messages, or open other files. Typically, payloads deliver when a certain condition occurs, such as when the date on the computer reaches a particular day.
    A virus variant is a virus that has been altered to take advantage of the original virus code. By doing this, the virus variant is easier to create, creating more virus versions.
  • Worm – Another form of virus that finds vulnerable computers and copies itself to those systems. The most frequent methods of propagation are from e-mail distribution lists, e-mail signature scripts, and shared folders on the network. Worms might or might not have a damaging payload. The typical payload for a worm makes a computer more susceptible to other viruses and Trojans.
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