Playfair cipher decrypt example

Two plaintext letters that fall in the same column are each replaced by the letter beneath, with the top element of the column circularly following the last. For example, mu is encrypted as CM. Otherwise, each plaintext letter in a pair is replaced by the letter that lies in its own row and the column occupied by the other plaintext letter. Example A keyword is "MONARCHY" then the matrix will look like The matrix is constructed by filling in the letters of the keyword minus duplicates from left to right and from top to bottom, and then filling in the remainder of the matrix with the remaining letters in alphabetic order.

Now you and Edith are both on your desk figuring it out. Then, replace them with the letters on the same row respectively but at the other pair of corners of the rectangle. The order is important — the first letter of the encrypted pair is the one that lies on the same row as the first letter of the plaintext pair. For decryption, you simply do the process in reverse.

Line 1 - 5: The 5 rows of the key table where letters are space-separated. Line 7: N , the number of messages to read. The following N lines: Each line contains a message. Save Article. Like Article. Encryption Technique. Output Key text: Monarchy Plain text: instruments Cipher text: gatlmzclrqtx. Output Key text: Monarchy Plain text: gatlmzclrqtx Deciphered text: instrumentsz. Next Hill Cipher. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment?

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