Caesar Cipher

Caesar Cipher.png

Dublin Core

Title

Caesar Cipher

Subject

Caesar Cipher

Description

The Caesar Cipher is one of the oldest ciphers, used by Julius Caesar to communicate with his generals. It works by shifting the alphabet down by a fixed number, or key. Due to the simplicity, it can be broken if the crypanalyst knows that a simple substitution method has been used to get the ciphertext, or the Caesar Cipher itself.

One method of deciphering a Caesar Cipher is by using a brute approach and noting the frequency of each letter used- then comparing those frequencies to a frequency distribution chart of the alphabet. For example, 'E' is the most freqently used letter in the alphabet. Theoretically, if 'G' is the most freqently used letter in the ciphertext, you may able to shift the alphabets so that 'E' aligns with 'G' to decipher the rest of the ciphertext.

Creator

Julius Caesar

Source

https://www.cs.mcgill.ca/~rwest/wikispeedia/wpcd/wp/c/Caesar_cipher.htm

Publisher

Cs.mcgill.ca

Date

44 B.C.

Format

.JPEG

Language

English

Type

Cipher

Still Image Item Type Metadata

Original Format

Cipher

Citation

Julius Caesar, “Caesar Cipher,” Ciphers and Encryption, accessed April 14, 2021, https://crypto.omeka.net/items/show/11.