Home computer security

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Home computer security

• By Stacy Wang
• Ben Wright

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Our Goal

• Audience
• What
• Why
• How

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Core Topics

• Password
• Anti-Virus
• Spoofing
• Firewalls

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password

• the benefit of using longer passwords

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Password

• Password is useful to protect our own
  information.
• The Using Dictionary program
• Access to our files, e-mail, funds or personal
  account information
• Will be able to modify these files, or to
  subscribe to unwanted services for which we have
  to pay.

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Password(continue.)

• Sniffer
• A technical way of learning passwords to look at
  the raw data transmitted across the net and
  decipher its contents.

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Password (Continue)

• Help all user to develop a necessary degree of
  complexity
• The Length
• The Width
• The Depth
• The Times
• Password Hashing Function

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Password
Network Security Essentials Stallings
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Anti-Virus

• What is virus?
• It is something into our computer though network.
• Can be infect other program by modifying them to
  include a possibly evolved copy of itself.
• There are some Virus
• The Malicious Programs
• The Trojans Horse

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better to install and keeping update Anti-Virus
Software

• Here are a few primary indicators that your
  computer might be infected
• Your computer runs more slowly than normal
• Your computer stops responding or locks up often
• Your computer crashes and restarts every few
  minutes
• Your computer restarts on its own and then fails
  to run normally
• Applications on your computer don't work
  correctly
• Disks or disk drives are inaccessible
• You can't print correctly
• You see unusual error messages
• You see distorted menus and dialog boxes

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How do we remove the computer virus?

• go on Microsoft Download center website, or
  click Start on the right corn of you monitor,
  then click Control Panel
• Click System, and then click the Automatic
  Updates tab.
• Click Performance and Maintenance, click System,
  and then click the Automatic Updates tab.
• Click the option that you want. Make sure
  Automatic Updates is not turn
• If you currently use antivirus software, visit
  the manufacturer's Web site, update it, and then
  perform a thorough scan of your system. If you
  don't currently use antivirus software, subscribe
  to a service and scan your system immediately.
• Download, install, and run the Malicious Software
  Removal Tool (for Microsoft Windows XP or Windows
  2000 users). Note that this tool does not prevent
  viruses from infecting your system it only helps
  to remove existing viruses.

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Phishing - History

• To steal consumers' personal identity data and
  financial account credentials1
• Around 1995 on AOL
• Only needed user name
• Evolving Complexity
• Being Educated is the best defense
• Bait and Switch

1 http//www.AntiPhishing.org
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Setting the Trap

• Email and Spam
• In 2004, 82 of US email was spam¹
• 2 billion spam emails are sent every day2
• ISPs and Spam filters only work so good.
• Zombies
• Targets eBay, Amazon, CitiBank

1 http//MessageLabs.com 2004 2
http//mailfrontier.com
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Spotting a fake

• Your account has been suspended.
• Ask you to provide private information
• Not personalized Valued Customer
• Digital signature

http//survey.mailfrontier.com
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www.PayPai.com
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And the Switch

• Stealing source
• Look identical to their real counterparts
• https//
• .

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Help is on the Way
Version 2.0 Firefox caught 79 phishing sites
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Version 7.0
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Firewalls

• Designed to monitor / screen network traffic

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Functions of a Firewall

• Packet filtering
• Application proxy
• NAT (network address translation)
• Monitoring and logging

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Transmission Control Protocol and Internet
Protocol TCP/IP

• Packet filtering
• Read the headers what and where
• Cost effective
• Examine transport like TCP or UDP
• Weakness no authentication, application attacks

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More Defenses

• Application Proxy
• Deeper inspection
• Costly each application has own rules

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Added Benefits

• NAT (Network Address Translation)
• Communication with firewall
• Monitoring and logging
• Track attempts
• See performance

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Problems

• Block unwanted programs!
• www.Portforward.com
• Confusing to configure

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Are you protected?
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Setting Up Firewall
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Ports and Configuring