The computer era of cryptography

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·         The computer era of cryptography 
  •   Cryptoanalysis of the new mechanical devices proved to be both difficult and laborious.
  •   In the United Kingdom, cryptoanalytic efforts at Bletchley Park during WWII spurred the development of more efficient means for carrying out repetitious tasks.
  •  This culminated in the development of the Colossus, the world's first fully electronic, digital, programmable computer, which assisted in the decryption of ciphers generated by the German Army's Lorenz SZ40/42 machine.
  • Just as the development of digital computers and electronics helped in cryptoanalysis , it made possible much more complex ciphers. Furthermore, computers allowed for the encryption of any kind of data re-presentable in any binary format, unlike classical ciphers which only encrypted written language texts; this was new and significant.
  • Computer use has thus supplanted linguistic cryptography, both for cipher design and cryptoanalysis.
  • Many computer ciphers can be characterized by their operation on binary bit sequences (sometimes in groups or blocks), unlike classical and mechanical schemes, which generally manipulate traditional characters (i.e., letters and digits) directly.
  • However, computers have also assisted cryptanalysis, which has compensated to some extent for increased cipher complexity.



·         Modern cryptography click here.....

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