Security

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Security

• WeeSan Lee weesan_at_cs.ucr.edu

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Roadmap

• Security Risks
• Preventions
• References

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Security Risks

• Computer Virus
• Worm
• Trojan Horse
• Adware
• Spyware
• Browser Hijacker
• Web Bug
• Email Hoaxes Chain Letters
• Phishing

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Security Risks - Computer Virus

• A small computer program that infects your
  computer without permission or knowledge of the
  user
• Infects others via a host media
• Floppy disk
• Email

http//www.healthinitiative.org/IMAGES/virus_big.j
pg
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Security Risks - Worm

• A self-replicating program, spreads across the
  Internet
• May contain viruses
• 1st worm was created by Robert T. Morris, a
  graduate student at Cornell U. in 1988
• Computer Emergency Response Team (CERT) was
  created as a result

http//tbn0.google.com/images?qtbnFuQHZgw5DccTfM
http//co.marion.or.us/NR/rdonlyres/481BF728-146C
-49E6-8C61-3D79ADD691F2/5465/worm.JPG
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Security Risks - Trojan Horse

• A program that disguises itself to be something
  useful or harmless
• Eg. screensaver
• In fact, a backdoor program which allows
  unauthorized access remotely

http//en.wikipedia.org/wiki/ImageTrojan_horse_C
387anakkale.jpg
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Security Risks - Adware

• An advertising-supported software

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Security Risks - Spyware

• Adware collecting users information without
  the users consent

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Security Risks - Browser Hijacker

• A program that changes the settings on the web
  browser
• Change the homepage to other website

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Security Risks - Web Bug

• Originally, use 1x1 image embedded in web pages
  or HTML emails to keep track of users
• AKA web beacon, tracking bug,
• To avoid that
• Turn off image loading on email clients
• Use text-based email such as pine ?

http//www.prospexis.net/images/beatle2.gif
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Security Risks - Hoaxes and Chain Letters

• Hoaxes are fake warnings, instructing you to
  delete files, playing on your sympathy, etc
• Chain letters implore you to pass the message to
  as many people as possible
• For examples
• This is not a hoax.
• Forward this email to 10 people you know for
  good luck
• VIRUS! DELETE NTFS.SYS

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Security Risks - Phishing
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Security Risks - Phishing
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Preventions

• Use anti-virus/firewall software
• For examples
• AVG (http//free.grisoft.com/)
• Nod32 (http//www.eset.com/)
• Norton Antivirus (http//www.symantec.com/)
• Schedule auto-update

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Preventions (cont)

• Backup
• Use 2 HDs
• Burn CDs/DVDs and give them to your mom
• Use online backup services
• http//www.carbonite.com/
• Be educated
• Dont fool around

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References

• Internet Effectively
• Ch 1
• Ch 4
• Wikipedia
• http//www.wikipedia.com/