It is known only to the sender and receiver. Key: It is the key to encrypt or decrypt the plaintext.Cipher: It is an algorithm for transforming plaintext to ciphertext.Ciphertext: It is an encrypted message.Plaintext: It is the original message that is to be encrypted. Therefore, the Playfair cipher is an example of a digraph substitution cipher.īefore moving ahead, let's understand the terminology used in this Playfair cipher. Since Playfair cipher encrypts the message digraph by digraph. It means treat I and J as the same letter, accordingly. Nevertheless, the plaintext contains J, then J is replaced by I. Therefore, one letter is excess so, a letter will be omitted (usually J) from the matrix. Another point to note that there are 26 alphabets and we have only 25 blocks to put a letter inside it. Note that any alphabet should not be repeated. The matrix contains alphabets that act as the key for encryption of the plaintext. It initially creates a key-table of 5*5 matrix. The only difference is that it encrypts a digraph (a pair of two letters) instead of a single letter. Playfair cipher is an encryption algorithm to encrypt or encode a message. In this section, we will discuss Playfair cipher along with its implementation in a Java program. It is an encoding procedure that enciphers more than one letter at a time. It is the most popular symmetric encryption technique that falls under the substitution cipher. But it was named for one of his friends Lord Lyon Playfair because he popularized its uses. Playfair cipher is proposed by Charles Whetstone in 1889. Is a valid ASCII string without any spaces.įor each test case, print the encoded string.Next → ← prev Playfair Cipher Program in Java The third line contains, the number of letters to rotate the alphabet by. The second line contains the unencrypted string. The first line contains the integer,, the length of the unencrypted string.
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