COMPUTER FUNDAMENTALS

Detailed explanation-1: -While Caesar’s was the first recorded use of this scheme, other substitution ciphers are known to have been used earlier. “If he had anything confidential to say, he wrote it in cipher, that is, by so changing the order of the letters of the alphabet, that not a word could be made out.

Detailed explanation-2: -Caesar Box. 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.

Detailed explanation-3: -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-4: -The first recorded use of cryptography for correspondence was by the Spartans, who as early as 400 bc employed a cipher device called the scytale for secret communication between military commanders.

Detailed explanation-5: -Caesar ciphers can be found today in children’s toys such as secret decoder rings. A Caesar shift of thirteen is also performed in the ROT13 algorithm, a simple method of obfuscating text used in some Internet forums to obscure text (such as joke punchlines and story spoilers), but not used as a method of encryption.