Security Systems for Digital Data
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This was one presentation I held last year during my exchange semester at the University of Nebraska at Omaha.
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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
- 4. Page H E L P M E I A M … wood cylinder strip of paper
- 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 +
- 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 …
- 19. cost increases per power (10.000 $, 100.000 $, 1.000.000 $, …) Key length in Bit Codebreaking timetable