Security Systems for Digital Data

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 +

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)

[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

[object Object],Quantum cryptography (I)

[object Object],[object Object],Quantum cryptography (II)

[object Object],Bernhard Hofer CIST 3100 - Organizations, Applications & Technology Thank you...

Security Systems for Digital Data

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