Security%20Chapter%208%20Objectives

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Security Chapter 8Objectives

• Societal impact of information and information
  technology
• Explain the meaning of terms related to computer
  security and crime and determine ways to protect
  both a business and yourself
• Identify areas of computer security vulnerability
  and ways to protect against them
• Recall the definition of encryption and apply the
  XOR encryption technique
• Recognize good and bad passwords based on
  password guidelines

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Security Resources you can use

• Protecting your computer sound byte
• http//wps.prenhall.com/bp_evans_techinaction_1/0,
  8697,1105530-,00.html
• Norton AntiVirus Response Center Web Page
• http//securityresponse.symantec.com/
• Test the vulnerability of your computer
• Gibson Research Corporation (http//www.grc.com)
• Qualys (http//browsercheck.qualys.com/)

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Computer security vulnerability points

• Hardware
• Software
• People

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Backup

• Data and Files are vulnerable
• Primary defense against data loss
• Selective, incremental full

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Software

• Perform regular updates
• http//update.microsoft.com for Windows
• Microsoft update Windows, Office, more
• Automatic updates
• Check with vendors for updates
• Verify e-mail notices independently

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Hackers

• Def
• Types of hackers
• White-hat
• Black-hat
• Script kiddies

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What Hackers Do

• Steal information from computers
• Credit card numbers
• Bank account numbers
• Internet packet sniffing
• Commit identity theft
• Create widespread computer attacks
• Backdoor programs (Trojan horse)
• Denial of service attacks

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How Hackers Gain Access

• Direct access
• Hacking software
• Indirect access
• Internet connection

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Firewall

• Def
• Types of firewalls
• Norton Personal Firewall
• McAfee Firewall
• Zone Alarm
• BlackICE PC Protection
• Network routers

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Computer Viruses

• What puts you at risk for viruses?

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How to "Catch" a Virus

• Email attachments. Do not open attachments
  before checking
• Is this email from someone I know?
• Is the message a sensible follow-up to the last
  message from the sender?
• Is the content of the message something the
  sender would say to me?
• Is there a reason for the sender to include an
  attachment?
• When in doubt, be cautious

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Antivirus Software

• Def
• Scan files looking for virus signatures (unique
  code)
• Provide options for deleting or fixing infected
  files
• Need to be updated frequently
• Examples McAfee, Norton, and Sophos, Inc.

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What Viruses Do

• Replicate themselves
• Slow down networks
• Display annoying messages
• Delete files
• Change computer settings

Melissa Caused 80 million damage
Nimda Affected more than 1 million computers
Love Letter Fastest spreading virus
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Logical security

• Def
• What are ways to protect your password?

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Biometric identification systems

• Fingerprint
• Palm print
• Iris scan
• Face recognition technology

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Encryption

• Def
• Encrypted data can be safely stored or
  transmitted
• Why is this needed?

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Encryption example

• Using Exclusive OR, XOR, ?
• If bits are the same, result is 0 if different 1
• Apply a key to the plain or clear text

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Encryption example

• 0101 Cleartext (The hex digit 5)
• ? 1001 Key

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Encryption example

• If the cleartext is the hex digit D and the XOR
  key is 1001, what is the encrypted text?

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Encryption example

• Encrypt the word NO with the key 10110110

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Assignment

• Using XOR and the key 10110110, determine the
  encrypted results for the ASCII text PASSWORD
• Complete HTML3