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a b c ……. z 0 1 2 ……. 25 - PowerPoint PPT Presentation


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Shift. Question 3:. Map:. a b c ……. z 0 1 2 ……. 25. Cipher. Plain. Shift = (Cipher – Plain) mod 26. We guess that the Key is: naughty To verify that “naughty” is indeed the Key, we attempt to shift the decrypted text to Position 0. Position 0 is where a Key should start.

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slide1

Shift

Question 3:

Map:

a b c ……. z

0 1 2 ……. 25

Cipher

Plain

Shift = (Cipher – Plain) mod 26

slide2
We guess that the Key is: naughty
  • To verify that “naughty” is indeed the Key, we attempt to shift the decrypted text to Position 0.
  • Position 0 is where a Key should start.
  • We note that “naughty” starts at Position 0.
  • Hence “naughty” is the Key.