Security Now 183

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Security Now
Episode 183


News and Errata

  • Microsoft Windows Update
  • IE7 Problems
  • Active X control issues
  • Firefox/Thunderbird/ Mozilla Update
  • Windows 7 security issues
  • SQL Attacks

Spinrite Story

Modes of Encryption

Starts 52:00

  • Asymmetric, where one key is used to encrypt and another to decrypt
  • Computationally intensive due to long key lengths being needed to get good security
  • Due to this the message is encrypted using symmetric encryption and the key to it encrypted using asymmetric

Symmetric block ciphers

  • 128 Bits go in, 128 bits come out.
  • Transformed into a different 128 bits
  • Change 1 bit on the input half of the output bits change
  • Other input the key
  • Strength of the encryption gets stronger exponentially with key length



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Production Information

  • Recorded Date: February 11, 2009
  • Release Date: February 12, 2009
  • Duration: 1:27:52
  • Log line:
  • Edited by: Tony
  • Notes: Were a couple of Mac sounds when Leo had run out of space on the Skype machine then had to empty trash.

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