CS 440 Computers, Ethics and Society

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CS 440 Computers, Ethics and Society

• Spring 2000
• Class 10
• February 08, 2000

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Thought for the Day

• When cryptography is outlawed,
• bayl bhgynjf jvyy unir cevinpl.

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Todays Cartoon

• The cartoon that was here came from Randy
  Glassbergens Cartoon of the Day site.

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Todays Agenda

• Finish Baase, chapter 2 Privacy AE 28, 35
• Baase, Chapter 3 Wiretapping Encryption
• Select 2 class monitors

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Reading Assignment

• Thursday Baase, chapter 4

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Debate Questions Feb 24

• Should Digital Signatures be as binding as
  physical signatures (pen paper)?
• Should anyone be able to write and use a program
  to play DVD disks?
• Is the loss of privacy due to the FBI NCIC a
  reasonable price to pay for the improvement in
  law enforcement?

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Debate Teams NCIC

• Yes
• Emmanuel Allen
• Frank Chen
• Bonita Oliver
• Mehul Vashi
• Antonio Wilder

• No
• Chris Baker
• Yancey Bond
• Misha Drlikova
• Kim Poole
• Steven Woods

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Debate Teams DVD

• Yes
• Regina Covington
• Jennifer Neuman
• Valerie Paris
• Eric Trzecki
• Dan Walsh

• No
• Tony Barrile
• David Chen
• Crutcher Dunnavant
• Jenny Tsen
• Ryan Varga

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Debate Teams Digital Signatures

• Yes
• Hattan Ahmed
• Dwight Clark
• George Washington
• Paul Wideman

• No
• James Crownover
• Josh Sanders
• Jamey Yarbrough
• Rondell Warren

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The EU, the USA and Privacy

• Whats the background? (AE 35)
• Whats the current situation?
• Whats likely to happen?
• Is there any interest in this by the political
  candidates?
• Should there be?

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Privacy The Very Idea

• What is privacy good for, anyway?
• Why do we want or need it?
• Do we need it?
• Have we always had privacy?

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Guidelines for information usage

• Informed consent
• Opt in/Opt out/ Opt in for each use.
• Free market view.
• Consumer protection view.

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Questions on Privacy

• What are the restrictions on Alabama drivers
  license information?
• In 1983, the federal government had an average of
  15 files for each person in the USA! What is it
  like now? What does this mean to our privacy?

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Questions on Privacy

• Where in Tuscaloosa (every-day life) is your
  picture taken (video cameras)?
• Blocking by 'demographic psychographic'
  profiles. What's in a psychographic profile?

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Group work

• Baase, page 77

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Ch 4 Reading Quiz

• Choose 2 questions
• Why is cryptography more dangerous than most
  weapons of war?
• Give one reason why prohibiting the export of
  strong cryptography is not very effective.
• What is one of the main arguments given by the
  government for wanting access to all encryption
  keys?
• What is one effect of the U.S. government's
  restrictions on export of strong cryptography?

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Ch 4 Wiretapping Encryption

• How common is/was wiretapping?
• Why does the export ban raise constitutional
  questions?
• What is so threatening about escrowed keys?
• Is the Administration still committed to limiting
  strong cryptography?

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Impromptu Class Debate

• East side We should use the Clipper chip.
• West side We should not use it.
• Think Pair Share
• List Arguments on each side

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Public Key Cryptography

• Public key Private key
• Cryptographically speaking, they are mirror
  images of each other.
• Mathematically speaking, you cant produce one
  from the other.
• What is encrypted with one can only be decrypted
  with the other.

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Crypto Key Length

• Each bit doubles the size of the key space.
• If it takes 100 hours to break a 56 bit key, how
  long will it take to break a 57 bit key?
• How long did it take EFF to break a 56 bit DES
  key?

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Using PGP

• Make a pair of keys.
• Get your public key signed by someone you trust.
• Post it somewhere, preferably a key server.
• Use it to sign all your email.
• How easy is it to spoof email?

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Communications Assistance for Law Enforcement Act
of 1994

• The Bill of Rights was to protect us from who?
• Key Escrow Can we trust the government?