Substitution Cipher
Title: @dooleyIntroductionRevolutionaryCipher2018 date: 2023-02-03 type: literature project:
tags:: #Substitution-cipher #Cipher #atomic projects::
Dooley mentions the substitution cipher and that it is one of the most simple kind of ciphers, it involves replacing each letter with a different letter or symbol using a map called a cipher alphabet. If you replace a letter with more than one symbol, that becomes a polyalphabetic substitution cipher.
The most simple kind is the cipher alphabet, in which you shift around the alphabet by a predefined number. If you perform a shift of 7,
Plain: abcdefghijklmnopqrstuvwxyz
Cipher: HIJKLMNOPQRSTUVWXYZABCDEFG
It would turn the word attack into HAAHJR.
It can also be randomly switched around as long as you have the key
Plain: abcdefghijklmnopqrstuvwxyz
Cipher: BDOENUZIWLYVJKHMFPTCRXAQSGS
The word enemy becomes NKNJS. This is very similar to the Caesar cipher linked below.
Citational Information¶
Dooley, J. 2018. History of Cryptography and Cryptanalysis. 2018. Available at https://books-scholarsportal-info.proxy.library.carleton.ca/en/read?id=/ebooks/ebooks4/springer4/2019-06-27/1/9783319904436 [Last accessed 29 January 2023].
Related Links¶
A historical example of the Substitution cipher would be the Ceasar Cipher.