5-Classical Encryption Techniques

Caesar cipher

is a simple encryption technique that was used by Julius Caesar to send secret messages to his allies. It works by shifting the letters in the plaintext message by a certain number of positions, known as the "shift" or "key".

Caesar Cipher technique

is one of the earliest and simplest methods of encryption technique. It's simply a type of substitution cipher, i.e., each letter of a given text is replaced by a letter with a fixed number of positions down the alphabet.

Vigenere Cipher

An advanced type of substitution cipher that uses a simple polyalphabetic code. The cipher is implemented using a table or square made up of twenty-six distinct cipher alphabets. The alphabet is written in its normal order. In each subsequent row, the alphabet is shifted one letter to the right until a 26X26 block of letters is formed.

Vigenere cipher

The Vigenere cipher is a plain-text form of encoding that uses alphabetical substitution to encode text. This ancient form of cryptography dates back to the 1400s and was documented in the works of famous writers of the era such as Trithemius.

Atbash cipher

(also called mirror cipher or backwards alphabet or reverse alphabet) is the name given to a monoalphabetically substitution cipher which owes its name and origins to the Hebrew alphabet. It replaces each letter with its symmetrical one in the alphabet, that is, A becomes Z, B becomes Y, and so on.

Keyword cipher

To create a substitution alphabet from a keyword, you first write down the alphabet. Below this you write down the keyword (omitting duplicate letters) followed by the remaining unused letters of the alphabet.