This is equivalent to using an un-keyed columnar transposition cipher. Many websites claim that the rail-fence cipher is a simpler "write down the columns, read along the rows" cipher. The railfence cipher offers essentially no communication security, and it will be shown that it can be easily broken even by hand.Īlthough weak on its own, it can be combined with other ciphers, such as a substitutionĬipher, the combination of which is more difficult to break than either cipher on it's own. It is a transposition cipher that follows a simple rule for mixing up the characters in the plaintext to form the ciphertext. Let us know in the comments if you are having any questions regarding this cryptography cipher Algorithm.Īnd if you found this post helpful, then please help us by sharing this post with your friends.The railfence cipher is a very simple, easy to crack cipher. HELLOWORLD Other cryptography algorithms: The following is the Rail Fence Cipher encryption algorithm program in C++. Hence, we will write the program of the Rail Fence Cipher algorithm in C++, although, it’s very similar to C. We will use C++ to write this algorithm due to the standard template library support. Then reads off to get the ciphertext: HOLELWRDLO For example, if 3 “rails” and the message “HELLOWORLD” is used, the cipherer writes out: H. When the top rail is reached, the message is written downwards again until the whole plaintext is written out. In the rail fence cipher, the plain text is written downwards and diagonally on successive “rails” of an imaginary fence, then moving up when the bottom rail is reached. It derives its name from the way in which it is encoded. The rail fence cipher (also called a zigzag cipher) is a form of transposition cipher. In this post, we will discuss the Rail Fence Cipher. There are exceptions and some cipher systems may use slightly more, or fewer, characters when output versus the number that was input. In common parlance, “cipher” is synonymous with “ code“, as they are both a set of steps that encrypt a message however, the concepts are distinct in cryptography, especially classical cryptography.Ĭodes generally substitute different length strings of character in the output, while ciphers generally substitute the same number of characters as are input. To encipher or encode is to convert information into cipher or code. An alternative, less common term is encipherment. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption-a series of well-defined steps that can be followed as a procedure.
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