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The PlayFair cipher is a symmetric cipher based on grid polygram substitution. How to encrypt using PlayFair cipher? Playfair encryption uses a grid, which can be generated by a key word. Example: Crypt DCODE with the grid: Split the text into bigrams of 2 letters (complete with a letter if the message is of odd length).
- Polygrammic Cipher, GRID_CIPHER
- What is PlayFair cipher? (Definition)The PlayFair cipher is a symmetric cipher based on grid polygram substitution.
- How to encrypt using PlayFair cipher?Playfair encryption uses a grid, which can be generated by a key word. Example: Crypt DCODE with the grid: \\ 1 2 3 4 5 1 A B C D E 2 F G H I J 3...
- How to decrypt PlayFair cipher?Playfair decryption requires a grid, which can be generated by a key word. Example: Decrypt DCODE with the grid: \\ 1 2 3 4 5 1 A B C D E 2 F...
- How to recognize PlayFair ciphertext?The ciphered message has an even number of letters. The message may have 25 distinct letters at most (the number of letters in the grid) It is impo...
- How to decipher PlayFair without the grid/key?PlayFair can be cracked using a known plaintext attack in order to discover a part of the grid.
- Multiple grids can fit a PlayFair cipher?Several squares can be used for the same decryption of Playfair , in fact, once a square grid of 25 is found, other squares obtained from the prev...
- What are the variants of the PlayFair cipher?Multiple variants can be found when encrypting bigrams . When letters are in column or in rows, it is possible to cipher with the on on the right...
- When PlayFair was invented?1854 by Charles Wheatstone, after the name of one of his friends Lord Playfair .
- Mono-Alphabetic Cipher
- Homophonic Substitution Cipher
- Polygram Substitution Cipher
- Polyalphabetic Substitution Cipher
Predictability of Caesar Cipher was its weakness once any key replacement of a single alphabet is known then, the whole message can we decipher and almost 25 attempts are required to break it. In this technique, we simply substitute any random key for each alphabet letter, that is 'A' can be being replaced with any letters from B to Z and 'B' can b...
The Homophonic substitution and mono-alphabetic substitution are very much alike. Like in plain cipher substation we replace an alphabet with a key but in case of Homophonic Substitution, we map an alphabet with a set of fixed keys (more than one key). For instance, A can be replaced with H, J, O, P and B will replace with any of the following insp...
In Polygram substitution cipher, instead of replacing one plain-text alphabet we simply replace a block of the word with another block of a word. Example, 'INCLUDEHELP' will change to 'WDSAEQTGTAI' whereas 'HELP' will replace to 'RYCV'. This is true that the last four letters are the same but still different in both words.
Polyalphabetic Substitution cipher was introduced by Leon Battista in the year 1568, and its prominent examples are Vigenère cipher and Beaufort cipher. We use multiple one-character keys, each key encrypts one plain-text character. This first key encrypts the first plain-text character, the second the key encrypt the second plain-text character an...
In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing ...
Mar 18, 2024 · The Playfair cipher offers the advantage of employing polygram substitution, which involves encrypting two letters together instead of single-letter substitution. This characteristic enhances the encryption complexity, significantly raising the difficulty level for potential attackers attempting to decrypt the message without possessing the key.
4. Polygram: Make arbitrary substitution for groups of characters. Encipher blocks of d>1 letters together as a unit. An example of a polygram substitution cipher is the Hill cipher which codes blocks of n let-ters into column vectors of dimension n. It en-ciphers a block of nletters by multiplying it by an n×n matrix to get a vector of n ...
A substitution cipher replaces each letter in the message with a different letter, following some established mapping. A simple example of a substitution cipher is called the Caesar cipher, sometimes called a shift cipher.
A list of Polygraphic Substitution ciphers. Four-Square Cipher. An algorithm invented by Felix Delastelle, published in 1902. Hill Cipher. An algorithm based on matrix theory. Very good at diffusion. Playfair Cipher. The technique encrypts pairs of letters (digraphs), instead of single letters as in the simple substitution cipher.
