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Security Systems for Digital Data

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Bernhard Hofer
Bernhard Hofer

This was one presentation I held last year during my exchange semester at the University of Nebraska at Omaha.

Tecnología
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Security Systems for Digital Data Big Brother is watching YOU Bernhard Hofer 03/10/2008 CIST 3100 - Organizations, Applications & Technology
Table of contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
Beginning of cryptography ,[object Object],[object Object],enlarge image
Page H E L P M E I A M … wood cylinder strip of paper
Terminology (I) ,[object Object],kryptós, „hidden“ graphéin, „to write“ „ secret writing“
Terminology (II) Hello, this is my first english pres at UNO … plaintext (ordinary information) encryption (converting plaintext) decryption (reverse process) H?$% /&!!““= )(/&%ded die=? 30((&% ?$$?) … ciphertext (unreadable plaintext) cipher key +
Table of contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
Cryptography nowadays (I) ,[object Object],[object Object]
[object Object],Cryptography nowadays (II)
[object Object],Cryptography nowadays (III)
Cryptography nowadays (IV) Key Server in a so called Trust Center Player 1 Player 2 public key private key … delivering message !! Authentication Problem !! Player 2 doesn‘t know, who sent the message!?! Everybody knows the public key from Player 2! … wants to deliver a SECURE message encrypting … decrypting …
Cryptography nowadays (VI) Key Server in a so called Trust Center Player 1 Player 2 public key private key … delivering message !! Confidentiality Problem !! Player 2 knows, who sent the message! But: Everybody could decrypt the message from Player 1! continue pres. … wants to deliver a SECURE message encrypting … decrypting …
[object Object],Cryptography nowadays (VIII)
Table of contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Big Brother www (I)
[object Object],Big Brother www (II)
[object Object],Big Brother www (III)
[object Object],!! YOUR PASSWORD !! Big Brother www (IV)
cost increases per power (10.000 $, 100.000 $, 1.000.000 $, …) Key length in Bit Codebreaking timetable
Table of contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Quantum cryptography (I)
[object Object],[object Object],Quantum cryptography (II)
Table of contents ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Bernhard Hofer CIST 3100 - Organizations, Applications & Technology Thank you...

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Security Systems for Digital Data

  • 1. Security Systems for Digital Data Big Brother is watching YOU Bernhard Hofer 03/10/2008 CIST 3100 - Organizations, Applications & Technology
  • 2.
  • 3.
  • 4. Page H E L P M E I A M … wood cylinder strip of paper
  • 5.
  • 6. Terminology (II) Hello, this is my first english pres at UNO … plaintext (ordinary information) encryption (converting plaintext) decryption (reverse process) H?$% /&!!““= )(/&%ded die=? 30((&% ?$$?) … ciphertext (unreadable plaintext) cipher key +
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. Cryptography nowadays (IV) Key Server in a so called Trust Center Player 1 Player 2 public key private key … delivering message !! Authentication Problem !! Player 2 doesn‘t know, who sent the message!?! Everybody knows the public key from Player 2! … wants to deliver a SECURE message encrypting … decrypting …
  • 12. Cryptography nowadays (VI) Key Server in a so called Trust Center Player 1 Player 2 public key private key … delivering message !! Confidentiality Problem !! Player 2 knows, who sent the message! But: Everybody could decrypt the message from Player 1! continue pres. … wants to deliver a SECURE message encrypting … decrypting …
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19. cost increases per power (10.000 $, 100.000 $, 1.000.000 $, …) Key length in Bit Codebreaking timetable
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.