Caesar Cipher in Cryptography | Information Security

Cryptography: The field of study related to encoding information.

The Caesar cipher was used by the Roman Army. The cipher was named after Julius Caesar who used it to encrypt military and other official messages.

Caesar cipher is a type of substitution cipher.

Caesar cipher is a simple form of a “substitution cipher” where you replace each letter of the alphabet with another letter by shifting the whole alphabet a certain number of letters.

Terms:

Crypto: “secret“

Graphy: “writing”

Encryption: is the process of translating plain text data (plaintext) into something meaningless (ciphertext).

Decryption: is the process of converting ciphertext back to plaintext.
Cipher: a method /algorithm that encrypts or disguises “text”;

Key: the set of parameter that guide a cipher;

Plaintext: The undisguised text is called “plaintext”;

Ciphertext: The disguised text is called “ciphertext”;

Cryptology “Science of secrets”

Steps:

Step 1. Write down each letter of the Alphabet (A-Z) in the plain row of the table.

Step 2. Select Shift Key Value ( 1 – 25 ).

Step 3. Using the shift Key value ( Key = 3), count the shift in the cipher row starting from left side of the row.

Step 4. Write down each letter of the Alphabet (A-Z) in the cipher row of the table until the end. continue writing down the remaining of alphabet letters.

Step 5 . Start encryption by selecting a message ( plaintext). Match the cipher letters ( cipher row) with each letter of your message ( plain row).

Tutorial Parts:

Introduction: 00:00
Terminology: 01:03
illustration: 02:04
Steps: 03:12
Encryption steps: 06:48
decryption steps: 10:54

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