![]() The algorithm you're describing is known as a generalized Caesar cipher. I believe there's a simpler way to do this. * Type the encoding key (numbers only): 234 * Type the encoding key (numbers only): 123 Printf("* Encoded text is: %s\n", input_msg) Implementing the function that retrieves a specific digit of a number Writing the function that counts how many digits there are in a number: ![]() ![]() The example below is not production code, its only meant for educational purposes. I took a shot and the input text is hardcoded within the application. I can't use an array because we don't know the length of the text. However, I can't find a good way to read the text and then cipher it. Keyarray= ((cypherkey-keyarray*1000)- keyarray*100)-keyarray*10 converting the cypher key into an array using a practical mathematic method for extracting its digit My first action was to convert the key to an array. The text will be moved K positions forward in the ASCII table, where K is the corresponding digit of the key. Then, using the ASCII table the 'ABC' will be converted to 'BDF'. Let's say that the text input was 'ABC' and the key was 123. Then the text will be converted in cipher using the following method. The user will give a 4 digit cipher key and a text. I want to make a program with the following capabilities. Once the translation table is known, the code is broken.I am working on a problem and I am a bit stuck so I thought to ask for your help. Because it’s based on the substitution of one letter with another based on a translation table.Translate each number of sum back to alphabet, it gives our ciphertext.If the sum produced is greater than 26, subtract 26 from it.Add each number corresponding to plain text alphabet and key.Do the same for each character of the key.Treat each plain text character as a number in the increasing sequence (A=0, B=1, …Z=25).(iii) Vernam Cipher – It uses a simple algorithm: Lets read it by 3 -> 2 -> 4 ->1 Cipher text : mkoieicn Plain text: come niki (suppose we have 4 columns ) Message thus obtained is cipher text message.Write the plain text message row by row in predefined columns.(ii) Simple Columnar Transposition Technique – It uses a simple algorithm: Read the plain text written in step 1 as sequence of rows.Write down plain text message as sequence of diagonals.(i) Rail Fence Technique – It uses a simple algorithm: In transposition technique, the identity of the characters remains unchanged, but their positions are changed to create the ciphertext. For encryption, Formula used : E=(M K)mod 26 After all keys are used, they are recycled. Each character is replaced by a number (A=0, B=1, …Z=25). ![]() Each of the keys encrypts one single character. This technique uses multiple character keys. In this rather than replacing one alphabet, block of alphabet is replaced. For example, a can be replaced with D and E. This is the best substitution technique with maximum security. In this technique, one plain text alphabet can map to more than one cipher text alphabet. For example, a can be replaced with B-Z, B can be replaced with A, C-Z. Therefore it makes harder for cryptanalyst to crack it. In Mono Alphabetic Cipher, There is no relation between Substitution of characters. Major disadvantage of caesar cipher is that all elements are substituted with same technique, it make easy for cryptanalyst to crack it. For example, a replaced with D, B replaced with E. In this all characters of plain text is replaced by other characters with same pattern.
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