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Read the selection and answer the question. Caesar Cipher The field of cryptography can be traced back to Julius Caesar in the first century BC
Read the selection and answer the question.
Caesar Cipher
The field of cryptography can be traced back to Julius Caesar in the first century BC Now referred to as "Caesar Cipher," this early method of message encryption simply substituted one letter of the alphabet for another. These substitutions were made according to a chosen "shift." For example, using a shift of one, the letter A becomes B B becomes C C becomes D etc. The first documented use of Caesar Cipher displayed a shift of three. Of course, with only twentysix potential shifts, Caesar Cipher was a very easy code to break, and over time, the technique became more associated with child's play than serious security. A good example of this demotion can be seen in the film A Christmas Story, where the young character of Ralphie eagerly uses his decoder ring to break a secret message from Little Orphan Annie. To his dismay, the secret messageDrink More Ovaltineturns out to be entirely commercially motivated.
On the other hand, there is one form of Caesar Cipher that continues to live on Known as "rot this formula uses a shift of thirteen to convert plaintext readable text to ciphertext. Because the English language has twentysix letters, a shift of thirteen is symmetrical, and in the computer world, the same command can be used to encrypt and decrypt information. Thus, for early computer users in the s rot became an easy way to communicate in codea practice that was often used in online forums to bypass language censorship. Frequent users even learned to read and write in rot as if it was a second language.
Using rot the letter A would become
A
B
B
M
C
N
D
Z
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