## How do you decrypt a Playfair cypher?

Decrypting the Playfair cipher is as simple as doing the same process in reverse. The receiver has the same key and can create the same key table, and then decrypt any messages made using that key.

What are the steps to encrypt a message using Playfair cipher approach?

The Playfair cipher encryption algorithm has two steps.

1. Generating the Key Square.
2. Encrypting the Plain Text.
3. Rules for Playfair Cipher Encryption.
4. Example of Playfair Cipher Encryption Algorithm.
5. Step 1 – Creating the key square.
6. Creating the Digraph.
7. Encryption Process.
8. Rules for Playfair Cipher Decryption.

### Is there any drawback of playfair cipher?

The main drawback of the traditional Playfair cipher is that the plain text can consist of 25 uppercase letters only. One letter has to be omitted and cannot be reconstructed after decryption. Also lowercase letters, white space, numbers and other printable characters cannot be handled by the traditional cipher.

Is there any drawback of Playfair cipher?

## How do you encode a hill cipher?

To encrypt a message using the Hill Cipher we must first turn our keyword into a key matrix (a 2 x 2 matrix for working with digraphs, a 3 x 3 matrix for working with trigraphs, etc). We also turn the plaintext into digraphs (or trigraphs) and each of these into a column vector.

Is there a way to decrypt the Playfair cipher?

Decryption Technique Decrypting the Playfair cipher is as simple as doing the same process in reverse. The receiver has the same key and can create the same key table, and then decrypt any messages made using that key. The Playfair Cipher Decryption Algorithm:

### When was the Playfair digraph substitution cipher invented?

The Playfair cipher was the first practical digraph substitution cipher. The scheme was invented in 1854 by Charles Wheatstone but was named after Lord Playfair who promoted the use of the cipher.

Why was the Playfair cipher used in World War 1?

In playfair cipher unlike traditional cipher we encrypt a pair of alphabets (digraphs) instead of a single alphabet. It was used for tactical purposes by British forces in the Second Boer War and in World War I and for the same purpose by the Australians during World War II.

## Is there an algorithm to decrypt the ciphertext?

Algorithm to decrypt the ciphertext: The ciphertext is split into pairs of two letters (digraphs). Note: The ciphertext always have even number of characters. If both the letters are in the same column: Take the letter above each one (going back to the bottom if at the top).