Cryptography

Paper Summary:

This paper discusses the importance of cryptography, explaining that it can be divided into two branches, transposition and substitution. The writer explains how knowledge of cryptography has spread and its uses today.

From the Paper:

"In transposition, letters in the message is rearranged, generating it into an anagram. Transposition has a weakness in that small words have a small number of ways it can be rearranged, which makes deciphering messages with very few letters easy; deciphering messages with a large number of letters would be nearly impossible since there may be millions of combinations that the message can form. The alternative to transposition is substitution. One of the earliest uses of a substitution cipher is the Caesar Shift Cipher, where messages were encoded by replacing each letter in the alphabet with the letter three places along. A cipher or encryption method is a procedure method for altering a plaintext message into cipher text by changing the letters of the plaintext using a transformation."

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