Var cipher = new string(alphabet.ToUpperInvariant().Reverse(). Atbash latin: Encode and decode online Originally used to encode the hebrew alphabet, Atbash () is formed by mapping an alphabet to its reverse, so that the first letter becomes the last letter. In the name of DRY (Don't Repeat Yourself), this can be reduced to: public static class AtbashCipher
It works by replacing each letter of the alphabet with its corresponding letter in the. Features of the Atbash Cipher: The Atbash Cipher is a simple substitution cipher that uses a specific set of rules to encode and decode messages. You may notice that Encode and Decode look very similar except for whether plain or cipher is chosen. The Atbash Cipher continued to be used throughout the centuries, even during the Middle Ages and Renaissance. Var index = cipher.Length - cipher.IndexOf(c) - 1 String cipher = new string(alphabet.ToUpperInvariant().Reverse().ToArray()) Public static string Decode(string input, string alphabet = DefaultAlphabet) Var index = plain.Length - plain.IndexOf(c) - 1 Get index of plain alphabet, but subtract from end Public static string Encode(string input, string alphabet = DefaultAlphabet)įoreach (var c in input.ToUpperInvariant())
Private const string DefaultAlphabet = "abcdefghijklmnopqrstuvwxyz" Here's my take on it: public static class AtbashCipher Then again, you don't need really Splitter. The way to avoid is to use upper case.Īlso the Splitter should just use the char and not convert ToList(). Something like: _input = input.ToLowerInvariant() Įxcept you should try to avoid the Turkish "ll" issue of surrogate pairs to be treated as single character. The Atbash cipher is a very common and simple cipher that simply encodes a message with the reverse of the alphabet. You should be sure to set the input string to lower case in case someone enters "Hello". If you keep as a class instance, Decode could be simplified to simply returning _input!!! You may even consider doing away with having a class instance and instead make the class and its methods static. There is no reason for _indices to be at the class level it should instead be locally defined in both Encode and Decode. The first two pairs of letters to be exchanged are also name-giving here: Aleph with Lamed, Beth with Mem.Since that AtBash Cipher is a simple reverse, you don't need both _plain and _cipher. By shifting the characters by half the alphabet width, ciphering and deciphering are identical. This is the same principle used in the Latin alphabet as ROT13. All you need to do is create a translation table with the letters of the alphabet written from A to Z across the top and. The Hebrew alphabet consisting of 22 characters is divided into two halves of 11 letters each (א-כ and ל-ת), these are directly assigned to each other.
Variant ALBaMĪLBaM (Hebrew אלבם) is an encryption method similar to ATBaSch. Therefore, it is sufficient to apply the Atbasch substitution a second time to the ciphertext to get the original text again. steers and queers urban dictionary Who We Are. The name Atbash is derived from the first and last two letters of the Hebrew writing system (A-T-B-Sch) and at the same time illustrates the procedure in which the first letter (Aleph) is exchanged with the last letter (Taw), the second letter (Beth) is exchanged with the penultimate letter (Shin) and so on.Ītbash belongs to the monoalphabetic monographic substitution methods and is a variant of Caesar encryption (reversed Caesar encryption).Ī special feature is that Atbasch is an involutory method, i.e., the encryption and decryption methods are identical. The original cabbalistic method was also used to reveal a meaning believed to be hidden in religious texts. Atbash (also atbash, Hebrew אתבש) is a simple method of encoding or decoding a text based on the Hebrew alphabet.
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