Classical Encryption Techniques

Symmetric cipher encryption techniques

There are two types of encryption methods:

Substitutional cipher

Transposition cipher 

Substitutional cipher:

It involves the replacement of characters given in the plain text and is converted to the cipher text with the replaced characters.


Caesar cipher

Monoalphabetic cipher

Playfair cipher

Viginere cipher

Hill cipher

Vernam cipher

Transposition ciphers:

These are ciphers which don’t replace any character from the plain text instead it will change the position of letters to make the cipher text.


Rail-fence transposition.

Simple columnar transposition.

Keyword columnar transposition.