Difference between revisions of "Encryption"
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The creator was Julius Caesar. | The creator was Julius Caesar. | ||
It is a substitution cipher which works by shifting letters by a number. The easiest way to look at a caesar cipher is to think of an inner and outer wheel, each wheel has the letters of the alphabet on its edge. When the letter A on both wheels are aligned the shift is 0 as in the image below: | It is a substitution cipher which works by shifting letters by a number. The easiest way to look at a caesar cipher is to think of an inner and outer wheel, each wheel has the letters of the alphabet on its edge. When the letter A on both wheels are aligned the shift is 0 as in the image below: | ||
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| + | [[File:Caesar-shift-0.jpg]] | ||
The shift turns the outer wheel a specific number of spaces. The image below shows a shift of 7: | The shift turns the outer wheel a specific number of spaces. The image below shows a shift of 7: | ||
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| + | [[File:Caesar-shift-7.jpg]] | ||
Revision as of 18:26, 16 December 2016
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Definitions
Plain text - The data in human readable form.
Cipher - An encryption method or algorithm.
Key - The data used to encrypt or decrypt the plain text.
Cipher text - The encrypted data which can only be understood if decrypted.
Caesar Cipher
The creator was Julius Caesar. It is a substitution cipher which works by shifting letters by a number. The easiest way to look at a caesar cipher is to think of an inner and outer wheel, each wheel has the letters of the alphabet on its edge. When the letter A on both wheels are aligned the shift is 0 as in the image below:
The shift turns the outer wheel a specific number of spaces. The image below shows a shift of 7:
