a b c ……. z 0 1 2 ……. 25

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

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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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.
• We note that “naughty” starts at Position 0.
• Hence “naughty” is the Key.