Basic HTML version of Foils prepared July 6 99

Foil 23 Cryptography (1)

From Security Infrastructure fo Electronic Commerce and Internet CPS714 Computational Science Information Track -- June 2 and June 7 99. by Roman Markowski
PlainText
Ciphertext
PlainText
Encryption
Decryption
Most ciphers consists of public algorithm and a key which needs to be long to be safe (40, 56, 128 bits)
Encryption and decryption is computationally expensive
Brute force attack:
  • if it takes one day for a device to break 40 bit DES,
  • it takes 7 years for the same device to break 56 bit DES
  • it takes several billion years to break 112 bit 3DES

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