MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The Caesar cipher is a classic example of ancient cryptography and is said to have been used by Julius Caesar. The Caesar cipher is based on transposition and involves shifting each letter of the plaintext message by a certain number of letters, historically three, as shown in Figure 5.1.

Detailed explanation-2: -It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on.

Detailed explanation-3: -The “Caesar Box, ‘’ or “Caesar Cipher, ‘’ is one of the earliest known ciphers. Developed around 100 BC, it was used by Julius Caesar to send secret messages to his generals in the field. In the event that one of his messages got intercepted, his opponent could not read them.

Detailed explanation-4: -What was the first type of encryption? The first encryption was the substitution cipher which used a very simple method of replacing units (letters or groups of letters) with other units based on a set of substitution rules, e.g., A=N, B=O, etc.

Detailed explanation-5: -In this cipher technique, we replace each letter of the alphabet with a letter that is standing three places further: In the generalized version of Caesar’s cipher each alphabet is replaced with another alphabet after shifting it x times to the right. The amount of the shift (x) is the encryption key.