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CS2910 Week 9, Class 2

Learn about network security, encryption, and the historical significance of the WWII Enigma machine and known-plaintext attack. Discover standard algorithms and the importance of session keys.

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CS2910 Week 9, Class 2

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  1. CS2910Week 9, Class 2 • Today • Network Security – Focus on Encryption • Week 9, Monday • Quiz: Potential topics • TCP window size & header format • Public/private key encryption • Sharing symmetric keys • Applying a stream cipher • Known-plaintext attack • Unicode, UTF-8 encoding, and quoted-printable • May include some questions requiring you to interpret or create raw data SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder

  2. WWII Encryption:The Enigma Machine A story of a known-plaintext attack http://www.cnet.com/pictures/breaking-the-nazis-enigma-codes-at-bletchley-park-photos/2/ SE-2811 Dr.Yoder

  3. WWII Encryption:The Enigma and the Bomb Mavis Batey SE-2811 Dr.Yoder

  4. Video Questions SE-2811 Dr.Yoder

  5. Video Questions SE-2811 Dr.Yoder

  6. Video Questions SE-2811 Dr.Yoder

  7. Video Questions SE-2811 Dr.Yoder

  8. Video Questions SE-2811 Dr.Yoder

  9. Themes • Standard Algorithms • What are they? • How do they work? • Why not make your own? • Session Keys • How to share keys? • Why use if public/private keys are needed anyway? • Why regenerate for every session? • Detecting Forgery / Man-in-the middle

  10. Standard Block Cipher Algorithms • DES, Triple DES (Data Encryption Standard) • NSA • AES (Advanced Encryption Standard) • NIST, but note NSA involvement in other algorithms published by NIST • Blowfish • Not standard. Self-published algorithm • Why not write your own? (Because …) SE-2811 Dr.Yoder

  11. SE-2811 Dr. Josiah Yoder

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